Add LICENSE and README

Author: jpsamaroo

LICENSE.md

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+The DaggerGPU.jl package is licensed under the MIT "Expat" License:
+
+> Copyright (c) 2020: Julian P Samaroo and contributors
+>
+> Permission is hereby granted, free of charge, to any person obtaining
+> a copy of this software and associated documentation files (the
+> "Software"), to deal in the Software without restriction, including
+> without limitation the rights to use, copy, modify, merge, publish,
+> distribute, sublicense, and/or sell copies of the Software, and to
+> permit persons to whom the Software is furnished to do so, subject to
+> the following conditions:
+>
+> The above copyright notice and this permission notice shall be
+> included in all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+> IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+> CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+> TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+> SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# DaggerGPU
+
+**GPU integrations for Dagger.jl**
+
+DaggerGPU.jl makes use of the `Dagger.Processor` infrastructure to dispatch Dagger kernels to NVIDIA and AMD GPUs, via CuArrays.jl and ROCArrays.jl respectively. Usage is simple: `add` or `dev` DaggerGPU.jl and CuArrays.jl/ROCArrays.jl appropriately, load it with `using DaggerGPU`, and add `DaggerGPU.CuArrayProc`/`DaggerGPU.ROCArrayProc` to your scheduler or thunk options (see Dagger.jl documentation for details on how to do this).
+
+DaggerGPU.jl is still experimental, but we welcome GPU-owning users to try it out and report back on any issues or sharp edges that they encounter. When filing an issue about DaggerGPU.jl, please provide your:
+- The complete error message and backtrace
+- Julia version
+- GPU vendor and model
+- CuArrays/ROCArrays version(s)