Update README.md with basic info.

README.md

@@ -1,3 +1,23 @@
-# Contacts extension for TYPO3
+# TYPO3 Extension tw_contacts
 
 Manage contact persons and show them on the TYPO3 frontend.
+
+## Features
+
+* Create records for contact persons inside the TYPO3 backend.
+* Frontend plugin for showing and searching contact persons.
+  * Sort by name
+  * Filter by category (sys_category)
+  * Search by search term
+* Kind of a feature: No CSS and no javascript included.
+
+## Usage
+
+1. Include the static TypoScript of the extension.
+2. Create some news records inside a sysfolder.
+3. Create a plugin on a page and select at least one sysfolder with contact records.
+
+## TYPO3 Version
+
+Right now this extension supports TYPO3 11.5.x.
+