Adding Dokka for code documentation

**Describe the bug**
Implementing Dokka in the project

**How to implement**
Steps to accomplish:
1. Go to build.gradle add dependencies
2. Go to the code section and use KDoc to comment
3. Go to terminal ./gradlew dokkaHtml

**Useful Resource**
[Article "Documentation using Dokka and KDoc"](https://proandroiddev.com/how-to-simplify-android-documentation-with-dokka-and-kdoc-252c1e226fe9)

