Added readme

README.md

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+# Hyperion
+Experimental framework for IIIF in JavaScript and Typescript.
+
+Aims to provide safe typings for valid Presentation 3 JSON-LD and normalization step (also with typings). 
+
+3 steps in that the library does:
+- Preprocess resources to ensure valid Presentation 3
+- Cast JSON to Typescript interface
+- Normalize resources into flat tree of resources
+
+This library can be the basis of other tools that want to work deeper with IIIF Presentation 3 resources.