added steps to restore changes to a file and to unstage a file

Author: thatjsprof

README.md

@@ -66,4 +66,10 @@ To remove a file use
 > git rm <file-name\>
 
 To remove a folder use
-> git rm -rf <folder-name\>
+> git rm -rf <folder-name\>
+
+To restore changes to a file use
+> git restore <file-name\>
+
+To unstage a file use
+> git restore --staged <file-name\>