Update README.md

README.md

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 # GodotHook
- A simple custom event system for Godot Engine
+ A lite custom event system for Godot Engine
+ 
+## Supported versions
+| Godot version | Supported |
+| - | - |
+| 3.x | yes |
+| 4.x | not yet |
 
-// Documentation: todo
+## Compilation
+- Download GodotHook and place it to the Godot `modules` folder.
+- Compile Godot like usual using one of [these guides](https://docs.godotengine.org/en/stable/development/compiling/index.html).
+
+Example compilation `Windows` command: `scons p=windows tools=yes -j4`
+
+## Methods
+```gdscript
+hook.GetTable()
+hook.Add(event: String, uid: String, function: FuncRef)
+hook.Call(event: String, args: Array)
+hook.Remove(event: String, uid: String)
+```
+
+## Usage
+`hook.Add` creates a new listening event and `hook.Call` executes all listening events of the same type, for example:
+
+```gdscript
+# autorun.gd
+
+func printHookOutput1(a: String, b: String):
+    print(a, " ", b)
+    
+func printHookOutput2(a: String, b: String):
+    print(a, " ", b)
+
+hook.Add("OnReady", "UniqueName1", funcref(self, "printHookOutput1"))
+hook.Add("OnReady", "UniqueName2", funcref(self, "printHookOutput2"))
+```
+```gdscript
+# any node script
+
+func _ready():
+    hook.Call("OnReady", ["Hey!", "It's OnReady hook!"])
+```
+
+`hook.Remove` removes any listening event by its name and type:
+
+```gdscript
+# can be executed in any place
+
+hook.Remove("OnReady", "UniqueName")
+```
+
+`hook.GetTable` returns a `Dictionary` with all added listening events
+
+```gdscript
+# can be executed in any place
+
+var hookTable: Dictionary = hook.GetTable()
+```