add contributing docs

CONTRIBUTING.md

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+# Contributing to Nx Plus
+
+We would love for you to contribute to Nx Plus! Read this document to see how.
+
+## Found an Issue?
+
+If you find a bug in the source code or a mistake in the documentation, you can help us by [submitting an issue](#submitting-an-issue). Even better, you can [submit a PR](#submitting-a-pr) with a fix.
+
+## Project Structure
+
+Source code and documentation are included in the top-level folders listed below:
+
+| Folder  | Purpose                                          |
+| ------- | ------------------------------------------------ |
+| `apps`  | Contains the e2e tests associated with a plugin. |
+| `libs`  | Contains the source code for plugins.            |
+| `tools` | Contains miscellaneous scripts.                  |
+
+## Building the Project
+
+To install dependencies after cloning the repo, run the following:
+
+```
+yarn
+```
+
+To build all plugins, run the following:
+
+```
+nx run-many --target build --all
+```
+
+## Testing your Changes
+
+To test your changes in a Nx workspace you can create a playground. To create a playground, run the following:
+
+```
+yarn create-playground
+```
+
+To update an existing playground, run the following:
+
+```
+yarn update-playground
+```
+
+### Running Unit Tests
+
+To run unit tests for all plugins, run the following:
+
+```
+nx run-many --target test --all
+```
+
+To run unit tests for a specific plugin such as Vue, run the following:
+
+```
+nx test vue
+```
+
+### Running e2e Tests
+
+To run e2e tests for all plugins, run the following:
+
+```
+nx run-many --target e2e --all
+```
+
+To run e2e tests for a specific plugin such as Vue, run the following:
+
+```
+nx e2e vue
+```
+
+## Submission Guidelines
+
+### Submitting an Issue
+
+Before submitting an issue please check that the issue you intend to create doesn't already exist. You can create new issues [here](https://github.com/ZachJW34/nx-plus/issues/new/choose).
+
+### Submitting a PR
+
+Before submitting a PR please check the following:
+
+- Your code is properly formatted
+  - To format all code, run `nx format:write --all`
+- You haven't introduced any lint errors or warnings
+- All unit tests are passing
+- All e2e test are passing (this may take a while, so you can delegate this to CI)