Create README.md

README.md

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+# Frick.NET
+
+## What is this?
+This is a simple [Brainfuck](https://github.com/sunjay/brainfuck/blob/master/brainfuck.md) interpreter written in .NET. It's not the first, certainly not the best, but it's mine.
+
+## Why?
+I was bored.
+
+## How do I use it?
+You can use Frick.NET in two ways: consume it as a class library or use the CLI.
+
+### Using the class library:
+```csharp
+using Frick.NET; 
+
+string source = "<your Brainfuck code goes here>";
+FrickInterpreter interpreter = new();
+interpreter.Run(source);
+```
+
+### Using the CLI:
+1. Build the CLI from source or download it from the Releases tab.
+2. You can pass Brainfuck code in the following ways:
+   * Pass a file name as an argument: `frick-cli -i <FILENAME>`
+   * Pass a file's content piped from STDIN: `'<Brainfuck goes here>' > frick-cli`
+   * Run `frick-cli` without any arguments and enter the code using the terminal