Add Readme in documentation folder

Author: VPDPersonal

Aspid.UnityFastTools/Assets/Plugins/Aspid/UnityFastTools/Documentation/README.md

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+# Unity Fast Tools
+**Unity Fast Tools** is a set of tools designed to minimize routine code writing in Unity. 
+## Source Code
+### [[Aspid.UnityFastTools](https://github.com/VPDPersonal/Aspid.UnityFastTools)] [[Aspid.UnityFastTools.Generators](https://github.com/VPDPersonal/Aspid.UnityFastTools.Generators)]
+---
+## **Examples**
+``` csharp
+using UnityEngine;
+using Aspid.UnityFastTools;
+
+public class MyBehaviour : MonoBehaviour
+{
+    private void Update()
+    {
+        DoSomething1();
+        DoSomething2();
+    }
+
+    private void DoSomething1()
+    {
+        using var _ = this.Marker();
+        // Some code
+    }
+
+    private void DoSomething2()
+    {
+        using (this.Marker())
+        {
+            // Some code
+            using var _ = this.Marker().WithName("Calculate");
+            // Some code
+        }    
+    }
+}
+```
+### Generated code
+``` csharp
+using System;
+using Unity.Profiling;
+using System.Runtime.CompilerServices;
+
+internal static class __MyBehaviourProfilerMarkerExtensions
+{
+    private static readonly ProfilerMarker DoSomething1_line_13 = new("MyBehaviour.DoSomething1 (13)");
+    private static readonly ProfilerMarker DoSomething2_line_19 = new("MyBehaviour.DoSomething2 (19)");
+    private static readonly ProfilerMarker DoSomething2_line_22 = new("MyBehaviour.Calculate (22)");
+ 
+    public static ProfilerMarker.AutoScope Marker(this MyBehaviour _, [CallerLineNumberAttribute] int line = -1)
+    {
+        if (line is 13) return DoSomething1_line_13.Auto();
+        if (line is 19) return DoSomething2_line_19.Auto();
+        if (line is 22) return DoSomething2_line_22.Auto();
+        
+        throw new Exception();
+    }
+}
+```
+
+![Aspid.UnityFastTools.MarkerTest.png](Images/Aspid.UnityFastTools.MarkerTest.png)