chore: add readme

README.md

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+# Siggingway
+
+Signature attribute for making working with signatures in Dalamud plugins super
+braindead.
+
+## Usage
+
+```c#
+public class Plugin : IDalamudPlugin {
+    [Signature("DE AD ?? EF", DetourName = nameof(MyDetour)]
+    private Hook<MyDelegate>? MyHook { get; init; }
+    
+    [Signature("CA ?? BA BE")]
+    private SomeGameFunctionDelegate? _someGameFunction;
+    private delegate void SomeGameFunctionDelegate();
+
+    public Plugin(SigScanner scanner) {
+        Siggingway.Siggingway.Initialise(scanner, this);
+    
+        // you still have to enable the hook
+        // be sure to check if it's null    
+        this.MyHook?.Enable();
+    }
+    
+    public void Dispose() {
+        this.MyHook?.Dispose();
+    }
+    
+    private void MyDetour() {
+        // this is called by the hook!
+
+        this._someGameFunction?.Invoke();
+    }
+}
+```