Create README.md

Author: Mike Solomon

README.md

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+# purescript-webgpu
+
+No-frills bindings to the webgpu API.
+
+## Goals
+
+1. As close to the WebGPU spec as possible.
+1. Very limited type-level machinery.
+1. Clickable docs.
+1. Small, single-purpose files.
+1. Tests as much of the surface area as possible.
+
+## Non-goals
+
+1. Fancy abstractions.