add screenshots and minor changes

Author: jzhengli

Diff for: README.md

@@ -1,7 +1,12 @@
 #LearnGit
-Teach team github
+PUGIS Internal GitHub Training
+
+##Step 0
+Download GitHub Desktop at https://desktop.github.com/
 ##Step 1
-Copy the git clone url from the right side of the project webpage at github. Start git shell, ```cd (directory)``` go to directory you want clone to and enter ```git clone ``` followed by the url you just copied. This will put a copy of the project on your local machine. If repo is already on local machine use ```git pull``` to get updated documents.
+Copy the git clone url from the right side of the project webpage. Start git shell, ```cd (directory)``` go to directory you want clone to and enter ```git clone ``` followed by the url just copied. This will put a copy of the project on local machine. If repository already existed use ```git pull``` to get updated documents.
+![Clone repository](/screenshots/Clone.PNG?raw=true "Clone Repo Url")
+![Shell command](/screenshots/Shell.PNG?raw=true "Clone to Local Directory")
 ##Step 2
 Change directory to working directory ```cd (directory)```
 ##Step 3
@@ -18,3 +23,4 @@ Pushes doc to default
 
 ##In case of problems
 You can use the ```git stash``` command to clear unwanted commits or other problems
+[To the beginning](#Step 0)