init commit

Author: michaelcao28

CONTRIBUTING.md

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 # Contributing guide
 
+Thank you for your interest in contributing to PyMC and PyMC-experimental!
+
+This page outlines the steps to follow if you wish to contribute to the pymc-experimental repo and clone the repo locally.
+
+## Install locally
+**1**: Create a folder `pymc-devs` in your local machine and follow the [cloning PyMC locally](https://www.pymc.io/projects/docs/en/latest/contributing/pr_tutorial.html).
+
+Since PyMC-experimental should integrate with the latest version of PyMC, it is recommended that any development work on PyMC-experimental must also work with the latest version of PyMC.
+
+You should now have a local copy of PyMC under `pymc-devs/pymc`.
+
+**2**: Fork the PyMC-experimental repo and clone it locally:
+
+```
+git clone [email protected]:<your GitHub handle>/pymc-experimental.git
+cd pymc-experimental
+git remote add upstream [email protected]:pymc-devs/pymc-experimental.git
+```
+
+Create a new conda environment by first installing the dependencies in the main PyMC repo:
+```
+conda env create -n pymc-experimental -f /path/to/pymc-devs/pymc/conda-envs/environment-dev.yml
+conda activate pymc-experimental
+pip install -e /path/to/pymc-devs/pymc
+
+# ignores the specific pymc version to install pymc-experimental
+pip install -e /path/to/pymc-devs/pymc-experimental --no-deps --ignore-installed pymc
+```
+
+## Develop the feature
+
+**1** Develop the feature on your feature branch:
+```
+git checkout -b my-exp-feature
+```
+
+
+
+You should now have a local copy of PyMC-experimental under `pymc-devs/pymc-experimental`.
+
+**Final steps**: Review contributing guide in [PyMC's main page](https://www.pymc.io/projects/docs/en/latest/contributing/index.html).
+
 Page in construction, for now go to https://github.com/pymc-devs/pymc-experimental#questions.