Add README, Contributing Guidelines and conda environment (#3)

* Add README, Contributing Guidelines and conda environment

* pip correction

.conda/environment.yml

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+name: uarray
+channels:
+  - pytorch
+  - xnd/label/dev
+  - defaults
+  - conda-forge
+dependencies:
+  - python=3.7
+  - pip
+  - sphinx
+  - sphinx_rtd_theme
+  - pytest
+  - pytest-cov
+  - mypy
+  - pytorch-cpu
+  - scipy
+  - gumath
+  - dask
+  - sparse
+  - doc8
+  - black
+  - pip:
+    - pytest-mypy
+    - pytest-black

CONTRIBUTING.md

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+# Contributing
+
+Contributions to `udiff` are welcome and appreciated. Contributions can take the form of bug reports, documentation, code, and more.
+
+## Getting the code
+
+Make a fork of the main [udiff repository](https://github.com/Quansight-Labs/udiff) and clone the fork:
+
+```
+git clone https://github.com/<your-github-username>/udiff
+```
+
+## Install
+
+Note that udiff supports Python versions >= 3.5. If you're running `conda` and would prefer to have dependencies
+pulled from there, use
+
+```
+conda env create -f .conda/environment.yml
+conda activate uarray
+```
+
+This will create an environment named `uarray` which you can use for development.
+
+`unumpy` and all development dependencies can be installed via:
+
+```
+pip install -e .
+```
+
+## Testing
+
+Tests can be run from the main uarray directory as follows:
+
+```
+pytest
+```

README.md

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+# udiff
+Automatic differentiation with uarray/unumpy.
+
+
+## Contributing
+
+See [`CONTRIBUTING.md`](CONTRIBUTING.md) for more information on how to contribute to `udiff`.