docs: Added CLA references

Author: TwoTenPvP

.github/CONTRIBUTING.md

@@ -1,16 +1,16 @@
 # How to contribute
-
 I'm really glad you're reading this, because we need volunteer developers to help this project evolve.
 
 If you haven't already, come find us on [Discord](http://discord.mlapi.network).
 
-## Submitting changes
+## CLA
+Before any changes will be approved into the repository, you will have to read and sign the [CLA](https://cla-assistant.io/MidLevel/MLAPI).
 
+## Submitting changes
 Please send a [GitHub Pull Request to MLAPI](https://github.com/midlevel/MLAPI/pull/new/master) with a clear list of what you've done (read more about [pull requests](http://help.github.com/pull-requests/)).
 Please follow our commit message conventions (below) and make sure all of your commits are atomic (one feature per commit).
 
 ## Commit Message Guidelines
-
 We have very precise rules over how our git commit messages can be formatted.  This leads to **more
 readable messages** that are easy to follow when looking through the **project history**.  But also,
 we use the git commit messages to **generate the MLAPI change log**. We follow angular's message format.

README.md

@@ -13,6 +13,8 @@
 [![Website](https://img.shields.io/badge/docs-website-informational.svg)](https://midlevel.github.io/MLAPI/)
 [![Wiki](https://img.shields.io/badge/docs-wiki-informational.svg)](https://midlevel.github.io/MLAPI/wiki/)
 [![Api](https://img.shields.io/badge/docs-api-informational.svg)](https://midlevel.github.io/MLAPI/api/)
+[![CLA assistant](https://cla-assistant.io/readme/badge/MidLevel/MLAPI)](https://cla-assistant.io/MidLevel/MLAPI)
+
 
 MLAPI (Mid level API) is a framework that simplifies building networked games in Unity. It offers **low level** access to core networking while at the same time offering **high level** abstractions. The MLAPI aims to remove the repetetive tasks and reduces the network code dramatically, no matter how many of the **modular** features you use.