Merge pull request #7 from ynput/enhancement/core-addon-readme

Addon README

README.md

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-AYON-core
+AYON Core addon
 ========
+
+AYON core provides the base building blocks for all other AYON addons and integrations and is responsible for discovery and initialization of other addons. 
+
+- Some of its key functions include:
+- It is used as the main command line handler in [ayon-launcher](https://github.com/ynput/ayon-launcher) application.
+- Provides publishing plugins that are available to all AYON integrations.
+- Defines the base classes for new pipeline integrations
+- Provides global hooks
+- Provides universally available loaders and launcher actions
+- Defines pipeline API used by other integrations
+- Provides all graphical tools for artists
+- Defines AYON QT styling
+- A bunch more things   
+
+Together with [ayon-launcher](https://github.com/ynput/ayon-launcher) , they form the base of AYON pipeline and is one of few compulsory addons for AYON pipeline to be useful in a meaningful way. 
+
+AYON-core is a successor to OpenPype repository (minus all the addons) and still in the process of cleaning up of all references. Please bear with us during this transitional phase.