Added a basic README

README.md

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+# Standard IO Gatherer
+### Usage
+```sh
+#!/bin/sh
+stdgather INTEL_DEBUG=shaders,ann,hex,bat MESA_SHADER_CACHE_DISABLE=true ./main
+```
+### Image
+![Screenshot of the above command in neovim with the syntax highlighting](./pics/stdgather_demo.png "stdgather demo")