doc: add installation instructions

Author: jeffreyguenther

README.md

@@ -1,8 +1,9 @@
 # GitHub MCP Server Extension for Zed
 
 This extension integrates [GitHub MCP Server](https://github.com/modelcontextprotocol/servers/tree/main/src/github) as a context server for
-Zed's Assistant.
+(Zed's)[https://zed.dev] [Assistant.](https://zed.dev/docs/assistant/assistant)
 
+To install navigate to: **Zed** > **Extensions**. Or use the command palette ([macOS](https://github.com/zed-industries/zed/blob/main/assets/keymaps/default-macos.json#L581), [Linux](https://github.com/zed-industries/zed/blob/main/assets/keymaps/default-linux.json#L459)) to search `extensions`.
 
 You'll need to [create](https://github.com/settings/tokens) a PAT with `repo` permissions.
 
@@ -15,3 +16,4 @@ You'll need to [create](https://github.com/settings/tokens) a PAT with `repo` pe
     }
   },
 ```
+<!--  -->