Add Install to README

Author: mykolaharmash

README.md

@@ -11,6 +11,10 @@ See [how it looks](#How-It-Looks-In-Action).
 
 ## Install
 
+```shell
+npm i -g git-jump
+```
+
 ## Usage
 
 ```shell

git-jump.1

@@ -74,6 +74,7 @@ Renames local branch. Proxy to the native "git branch --move <branch name> <new
 .RE
 
 .B Support:
+
 .RS 2
 Most of the support happens through the GitHub repo https://github.com/mykolaharmash/git-jump.