Add documentation for creating .ignore file

Author: aviskarkc10

README.md

@@ -18,6 +18,14 @@ will produce default command
 
  ```git commit -m "New feature"``` and execute it
 
+You can create a file `.ignore` in your directory to add custom branches you want to ignore. Example `.ignore` file:
+
+```
+hot-fix
+sprint-11
+new-feature
+```
+
 ### Installation
 Run this command on terminal