Updated README.md

README.md

@@ -10,4 +10,27 @@ Communicate privately with one or more users. Clarify details which you do not w
 - Discuss views with multiple discussion partners in groups
 - Liven up the discussion with pictures and attachments
 - Clarify your point with a wide range of formatting options
-- and...emojis (of course) 
+
+## Build
+
+In order to build script or stylesheet run:
+
+Install npm packages:
+
+```
+npm install
+```
+
+Manually build:
+
+```
+grunt build
+```
+
+Watch for file changes:
+
+```
+grunt watch
+```
+
+> Note: While development you should set the `forceCopy` publish option of the mail asset bundles to true.