docs(contributing): added CONTRIBUTING.md and updated README

Author: sindrekjr

CONTRIBUTING.md

@@ -0,0 +1,13 @@
+# Contributing
+
+If you wish to contribute to this project, simply fork and the clone the repository, make your changes (on master or a feature branch, up to you), and submit a pull request. Contributions are quite welcome!
+
+## Guidelines
+
+* Keep in mind that using the template is intended to be quite straightforward even without specific .NET experience.
+* Please adhere to the [conventional commit format](https://www.conventionalcommits.org/en/v1.0.0/).
+
+## Wanted Contributions
+
+* **Benchmarking.** Some plug-n-play benchmarking utility would be a great boon to anyone wanting to track the efficiency of their solutions.
+* **Example projects.** If you have been using this template yourself, your project might serve as a useful example in the README's "example projects" section.

README.md

@@ -12,6 +12,7 @@ Template project for solving Advent of Code in C#, running on [.NET 5.0](https:/
   - [Using a Solution's Constructor](#using-a-solutions-constructor)
   - [Using .NET Core](#using-net-core)
   - [Automatic Debugger Break On Exception](#automatic-debugger-break-on-exception)
+- [Background](#background)
 - [Contributing](#contributing)
 - [License](#license)
 
@@ -111,8 +112,11 @@ Simply swap out the target framework in `AdventOfCode.csproj`.
 ### Automatic Debugger Break On Exception
 When running your Solutions with a Debugger attached e.g. [VSCode](https://code.visualstudio.com/docs/editor/debugging) or [Visual Studio](https://docs.microsoft.com/en-us/visualstudio/debugger/quickstart-debug-with-managed?view=vs-2019) the ASolution base class will try to pause/break the debugger when there is an uncaught Exception thrown by your solution part. This allows for inspection with the debugger without having to specifically set-up additional exception handling within the debugger or your solution.
 
+## Background
+I intended to use Advent of Code 2019 to learn C#, and found that I wanted to try to put together a small solutions framework of my own. In that way this template came about as an introductory project to C# and .NET Core.
+
 ## Contributing 
-Sure! Fork the project, make your changes, and create a pull request. Submitted issues and pull requests are quite welcome.
+Sure! Check out the [contributing guide](https://github.com/sindrekjr/AdventOfCodeBase/blob/master/CONTRIBUTING.md).
 
 ## License
 [MIT](https://github.com/sindrekjr/AdventOfCodeBase/blob/master/LICENSE.md)