added README.md and some screenshots

README.md

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+# Description
+My Cinnamon theme based on Plata-Lumine and Yaru-light
+#Features
+* Changed color scheme in grouped window list
+* Changed title bar height in comparision with original Yaru-light
+
+#Screenshot
+![screenshot](screenshots/desktop_screenshot.png?raw=true)
+
+#Compare
+####Plata-Lumine
+![before](screenshots/plata_lumine.png?raw=true)
+####rinaldus-cinnamon-theme
+![after](screenshots/rinaldus_cinnamon_theme.png?raw=true)
+####Yaru-light
+![before](screenshots/yaru_light.png?raw=true)
+####rinaldus-cinnamon-theme
+![after](screenshots/rinaldus_cinnamon_theme2.png?raw=true)
+
+#Install
+Just clone this repository to your `~/.themes` directory.