change(ui): add small note to readme

frontend/README.md

@@ -1,7 +1,7 @@
 # openreplay-ui
 OpenReplay prototype UI
 
-On new icon addition: 
+On new icon addition:
 `yarn gen:icons`
 
 ## Documentation
@@ -14,3 +14,7 @@ On new icon addition:
 Labels in comments:
 TEMP = temporary code
 TODO = things to implement
+
+## Contributing notes
+
+Please use `dev` branch as base and target branch.

tracker/README.md

@@ -7,16 +7,16 @@ In order to build locally any of the javascript packages located under this dire
 cd tracker	# or any tracker-* plugin
 
 ```
-Then run 
+Then run
 ```sh
-yarn		
-yarn build  
+yarn
+yarn build
 ```
 OR
 
 ```sh
-npm i	
-npm run build  
+npm i
+npm run build
 ```
 
 You can then use it as a local javascript package by executing the folowing line under your local project location:
@@ -29,3 +29,7 @@ OR
 npm install --save ../path/to/openreplay/monorepo/tracker/tracker
 ```
 
+
+## Contributing notes
+
+Please use `dev` branch as base and target branch.