Update procedure for recording contributors

Author: saxbophone

CONTRIBUTING.md

@@ -2,6 +2,13 @@
 
 Thanks for considering contributing to libsxbp!
 
+First of all, please read and make sure that you agree to this project's **Contributor License Agreement**:
+
+- If you are contributing as an individual, please read and sign [this document](CLA_INDIVIDUAL.md).
+- If you are contributing as an entity (e.g. a company or organisation), please read and sign [this document](CLA_ENTITY.md).
+
+Signed copies of the above agreements should be emailed to me (@saxbophone / Joshua Saxby) at <[email protected]>. I will then add your details (full name and email address) to the [CONTRIBUTORS.md](CONTRIBUTORS.md) file in this repository. **If you do not want me to put your email address in this file, then tell me so and I will use another public handle of yours (most likely your Github username).**
+
 To get started, [sign the Contributor License Agreement](https://www.clahub.com/agreements/saxbophone/libsxbp).
 
 > [A copy of the CLA](CLA_INDIVIDUAL.md) is also available in this repository.

CONTRIBUTORS.md

@@ -0,0 +1,11 @@
+# Contributors to libsxbp
+
+All of these people have my eternal gratitude
+
+## Individuals
+
+...
+
+## Entities
+
+...