Update README.md

Updated instructions.

Author: Fmstrat

README.md

@@ -1,5 +1,7 @@
 # ownNote
 
 ## Installation
-Place this app in **owncloud/apps/**
+- Place this app in **owncloud/apps/**
+- Add the following to your **owncloud/config/config.php**:
+    - 'custom_csp_policy' => "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; frame-src *; img-src *; font-src 'self' data:; media-src *",