Update docs to include CSP authentication support (#114)

Co-authored-by: Anil Kodali <akodali@vmware.com>
Co-authored-by: Yuqi Jin <jyuqi@vmware.com>
Co-authored-by: Jerry Belmonte<bjerry@vmware.com>
Co-authored-by: John Cornish<jcornish@vmware.com>

Author: 3 people

.gitignore

@@ -9,4 +9,5 @@ lib64/
 env/
 venv/
 .idea/
-.vscode/
+.vscode/
+.envrc

CONTRIBUTING.md

@@ -0,0 +1,59 @@
+# How to Contribute
+
+* Reach out to us on our public [Slack channel](https://www.wavefront.com/join-public-slack).
+* If you run into any issues, let us know by creating a GitHub issue.
+
+## Testing
+
+We have a handful of GitHub actions to check code and run tests, but most of our testbeds consist of Python [unittest](https://docs.python.org/3/library/unittest.html). Please write Python [unittest](https://docs.python.org/3/library/unittest.html#basic-example) for new code that you create.
+
+## Submitting Changes
+
+* When submitting changes, make sure that you increment the **version** number in [setup.py](setup.py).
+  The version number is documented as such in the setup.py file.
+* We follow [semantic versioning](https://semver.org/).
+* For bug fixes, increment the patch version (last number).
+* For backward compatible changes to the API, update the minor version (second number), and zero out the patch version.
+* For breaking changes to the API, increment the major version (first number) and zero out the minor and patch versions.
+
+## Coding Conventions
+
+Start reading our code and you'll get the hang of it. We use linters and the following and code checks:
+
+* Install Linters
+
+    ```bash
+    python -m pip install -U flake8 flake8-colors
+    python -m pip install -U flake8-import-order pep8-naming
+    python -m pip install -U pydocstyle pylint
+    ```
+
+* Install Extra Dependencies
+
+    ```bash
+    python -m pip install -U Deprecated requests tdigest
+    ```
+
+* Run Flake8 Checks
+
+    ```bash
+    python -m flake8
+    ```
+
+* Run PyLint Checks
+
+    ```bash
+    python -m pylint -d duplicate-code wavefront_sdk
+    ```
+
+* Run PyDocStyle
+
+    ```bash
+    python -m pydocstyle
+    ```
+
+* Execute Unit Tests
+
+    ```bash
+    python -m unittest discover
+    ```