Update README.md

README.md

@@ -2,9 +2,21 @@
 
 `master`
 
+> **If you like this repo, STAR it plz.** 
+
+## Quick Use
+
+Switch to certain branch on github repo page, then click **download as zip** and enjoy!
+
 ## Usage
 
-You have to install `git` on your device.
+You have to install `git` on your device first.
+
+### Extend CDE
+
+Use `git checkout extend` to get `mycpu` verilog project.
+
+### CG Homework
 
 Use `git checkout [branch_name]` to get the code you need in CG.
 
@@ -14,4 +26,4 @@ For example, to get homework 2-1 RegFile, type following commands
 git checkout 2-1
 ```
 
-Then compress all files in the current dictory and upload it to CG.
+Then compress all files in the current directory and upload it to CG.