Create README.md

Author: Robbepop

README.md

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+# Wasmi specific Wast Tests
+
+This repo contains some Wast tests from the official Wasm spec testsuite that have been modified to work with Wasmi.
+
+In particular this repository contains the following subsets of the official Wasm spec testsuite:
+
+1. `proposals/memory64`
+    - This has been modified to remove references from Wasm proposals unsupported by Wasmi such as the `exceptions` and `function-references` proposal.
+    - At the time of writing this the Wasm spec testsuite is about to be moved over to Wasm 3.0 while Wasmi does not even support all of Wasm 2.0.
+      Therefore, for a subset of the Wasm spec testsuite features we rely on this fork to provide the proper tests that can be consumed by Wasmi.