[TASK] Add integration instructions

README.md

@@ -8,4 +8,22 @@ Repository: https://gitlab.sgalinski.de/typo3/sg_youtube
 
 Please report bugs here: https://gitlab.sgalinski.de/typo3/sg_youtube
 
-TYPO3 version: >7.6
\ No newline at end of file
+TYPO3 version: >8.7
+
+## Installation / Integration
+
+First install the extension and activate it in the Extension-Manager.
+
+### TypoScript integration
+
+* Include the TypoScript in Configuration/TypoScript/setup.typoscript and constants.typoscript in your theme.
+* Add your Youtube API key:
+
+```
+plugin.tx_sgyoutube {
+	settings {
+		# cat=plugin.tx_sgyoutube/file; type=string; label=YouTube API Key
+		apiKey = <your-api-key>
+	}
+}
+```