Create README.md

Author: torkelo

README.md

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+# Grafana Image Renderer
+
+A Grafana Backend Plugin that handles rendering panels & dashboards to PNGs using headless chrome.
+
+# Dependencies
+
+Nodejs v8+ installed. 
+
+# Installation 
+
+- git clone into Grafana external plugins folder. 
+- yarn install --pure-lockfile
+- npm run build
+- restart grafana-server , it should log output that the renderer plugin was found and started. 
+- To get more logging info update grafana.ini section [log] , key filters = rendering:debug