Update README.md with new Notion SDK features and examples

Author: KoditkarVedant

README.md

@@ -38,10 +38,12 @@ Provides the following packages:
 dotnet add package Notion.Net
 ```
 
-**Note:** default Notion-Version used by NuGet package versions
+**Note:** Default Notion-Version used by NuGet package versions
 | Package version | Notion-Version |
 | --- | --- |
-| 4.0.0-preview-1.8.21.2022 | 2022-06-28 | 
+| 4.4.0+ | 2022-06-28 |
+| 4.3.0+ | 2022-06-28 | 
+| 4.0.0+ | 2022-06-28 | 
 | 3.0.0+ | 2022-02-22 |
 | 2.0.0+ | 2021-08-16 |
 | 1.0.0+ | 2021-05-13 |
@@ -67,14 +69,33 @@ var usersList = await client.Users.ListAsync();
 
 ## Dependency Injection
 
-Library also provides extension method to register NotionClient with Microsoft dependency injection.
+The library provides an extension method to register NotionClient with Microsoft dependency injection.
 
-```
+```csharp
 services.AddNotionClient(options => {
   options.AuthToken = "<Token>";
 });
 ```
 
+Then inject `INotionClient` into your services:
+
+```csharp
+public class MyService
+{
+    private readonly INotionClient _notionClient;
+    
+    public MyService(INotionClient notionClient)
+    {
+        _notionClient = notionClient;
+    }
+    
+    public async Task<Database> GetDatabaseAsync(string databaseId)
+    {
+        return await _notionClient.Databases.RetrieveAsync(databaseId);
+    }
+}
+```
+
 ### Querying a database
 
 After you initialized your client and got an id of a database, you can query it for any contained pages. You can add filters and sorts to your request. Here is a simple example:
@@ -109,30 +130,42 @@ var complexFiler = new CompoundFilter(
 
 ## Supported Endpoints
 
-- [x] Databases
+- [x] **Authentication**
+  - [x] Create access token
+  - [x] Revoke access token  
+  - [x] Introspect token (get token status and details)
+  - [x] Refresh access token
+- [x] **Databases**
+  - [x] Retrieve a database
   - [x] Query a database
   - [x] Create a database
-  - [x] Update database
-  - [x] Retrieve a database
-- [x] Pages
+  - [x] Update a database
+- [x] **Pages**
   - [x] Retrieve a page
   - [x] Create a page
-  - [x] Update page
+  - [x] Update page properties
   - [x] Retrieve page property item
-- [x] Blocks
+- [x] **Blocks**
   - [x] Retrieve a block
   - [x] Update a block
   - [x] Retrieve block children
   - [x] Append block children
   - [x] Delete a block
-- [x] Comments
+- [x] **Comments**
   - [x] Retrieve comments
   - [x] Create comment
-- [x] Users
-  - [x] Retrieve a User
+- [x] **Users**
+  - [x] Retrieve a user
   - [x] List all users
-  - [x] Retrieve your token's bot user
-- [x] Search
+  - [x] Retrieve your token's bot user (me)
+- [x] **Search**
+  - [x] Search across pages and databases
+- [x] **File Uploads**
+  - [x] Create file upload
+  - [x] Send file upload
+  - [x] Complete file upload (for multi-part uploads)
+  - [x] List file uploads
+  - [x] Retrieve file upload
 
 ## Enable internal logs
 The library make use of `ILoggerFactory` interface exposed by `Microsoft.Extensions.Logging`. Which allow you to have ability to enable the internal logs when developing application to get additional information.
@@ -156,7 +189,102 @@ You can set the LogLevel in config file.
 }
 ```
 
-You can also refer `examples/list-users` example.
+You can also refer to the `examples/list-users` example.
+
+## Error Handling
+
+The SDK provides specific exception types for common API errors:
+
+```csharp
+try
+{
+    var page = await client.Pages.RetrieveAsync(pageId);
+}
+catch (NotionApiRateLimitException rateLimitEx)
+{
+    // Handle rate limit - check rateLimitEx.RetryAfter for when to retry
+    Console.WriteLine($"Rate limited. Retry after: {rateLimitEx.RetryAfter}");
+}
+catch (NotionApiException apiEx)
+{
+    // Handle other API errors
+    Console.WriteLine($"API Error: {apiEx.NotionAPIErrorCode} - {apiEx.Message}");
+}
+```
+
+## Examples
+
+The repository includes several example projects to help you get started:
+
+- **[`examples/list-users`](examples/list-users/)** - Basic example showing how to list users and configure logging
+- **[`examples/aspnet-core-app`](examples/aspnet-core-app/)** - ASP.NET Core integration example with dependency injection
+- **[`examples/print-database-property-name-and-values`](examples/print-database-property-name-and-values/)** - Working with database properties
+
+## More Code Examples
+
+### Creating a Page
+```csharp
+var newPage = await client.Pages.CreateAsync(new PagesCreateParameters
+{
+    Parent = new DatabaseParentInput { DatabaseId = databaseId },
+    Properties = new Dictionary<string, PropertyValue>
+    {
+        {
+            "Title", new TitlePropertyValue
+            {
+                Title = new List<RichTextBase>
+                {
+                    new RichTextText { Text = new Text { Content = "My New Page" } }
+                }
+            }
+        }
+    }
+});
+```
+
+### Working with Blocks
+```csharp
+// Append a paragraph block to a page
+var appendResponse = await client.Blocks.AppendChildrenAsync(new BlockAppendChildrenRequest
+{
+    BlockId = pageId,
+    Children = new List<ICreateBlock>
+    {
+        new ParagraphBlock
+        {
+            Paragraph = new ParagraphBlock.ParagraphData
+            {
+                RichText = new List<RichTextBase>
+                {
+                    new RichTextText
+                    {
+                        Text = new Text { Content = "This is a new paragraph!" }
+                    }
+                }
+            }
+        }
+    }
+});
+```
+
+### File Upload
+```csharp
+// Create file upload
+var fileUpload = await client.FileUploads.CreateAsync(new CreateFileUploadRequest
+{
+    Name = "example.pdf",
+    FileType = FileType.Pdf,
+    FileSize = fileSize,
+    ExpiresTime = DateTime.UtcNow.AddHours(1)
+});
+
+// Send the file
+var sendResponse = await client.FileUploads.SendAsync(new SendFileUploadRequest
+{
+    FileUploadId = fileUpload.Id,
+    FileContent = fileBytes
+});
+```
 
 ## Contributors
 This project exists thanks to all the people who contribute.