Merge pull request #13 from mapmanager/dev

Update README to switch from npm to yarn

Author: Suhayb-A

README.md

@@ -8,8 +8,8 @@ A web version of PyMapManager
 * `git submodule init`
 * `git submodule update`
 * Install [NodeJs](https://nodejs.org/en)
-* Run `npm install` to install dependencies
+* Run `yarn install` to install dependencies
 
 ## Running WebMapManager
-* Run `npm start` to run the application
+* Run `yarn start` to run the application
 * Open [http://localhost:3000](http://localhost:3000) to view it in the browser (Tested on Google Chrome).