Merge pull request #18 from pixelant/update-readme

[TASK] Update README with documentation overview

Author: MattiasNilsson

README.md

@@ -2,7 +2,18 @@
 
 Configurable, demand-based filtering framework with permalink-support for TYPO3.
 
-### Example configuration
+## Documentation
+
+For all kind of documentation which covers install to how to develop the extension:
+
+| Source           | URL                                                                |
+|------------------|--------------------------------------------------------------------|
+| **Repository:**  | https://github.com/pixelant/demander                               |
+| **Read online:** | https://docs.typo3.org/p/pixelant/demander/master/en-us |
+| **TER:**         | https://extensions.typo3.org/extension/demander         |
+
+
+## Example configuration
 
 ```typo3_typoscript
   properties {