Add a README

packages/common/README.md

+# VPU Common Code
+
+[GitLab Repository](https://gitlab.tugraz.at/VPU/WebComponents/Common)
+
+## Icon Web Component
+
+For valid icon names see: https://materialdesignicons.com
+
+```html
+ <vpu-icon color="orange" name="menu-down"></vpu-icon>
+```