Update README.md

Author: IntoTheDev

README.md

@@ -1,2 +1,93 @@
 # Object-Pooling-for-Unity
 Object Pooling for Unity
+
+## Features
+- Faster in terms of performance than Instantiate/Destroy
+- Easy to use
+- Easy to integrate with already written spawn systems
+- Callbacks OnSpawn & OnDespawn for resseting after object being used
+
+## Usage
+How to populate pool:
+```csharp
+using ToolBox.Pools;
+using UnityEngine;
+
+public class Spawner : MonoBehaviour
+{
+	[SerializeField] private GameObject _prefab = null;
+
+	private void Awake()
+	{
+		// Use this only with Prefabs
+		_prefab.Populate(count: 50);
+	}
+}
+```
+
+Also, you can just put PoolInstaller component on any object on Scene and select which objects you want to prepopulate
+![](https://i.imgur.com/gnyZ0RQ.png)
+
+How to spawn object from pool:
+```csharp
+using ToolBox.Pools;
+using UnityEngine;
+
+public class Spawner : MonoBehaviour
+{
+	[SerializeField] private GameObject _prefab = null;
+
+	public void Spawn()
+	{
+		// Use this only with Prefabs
+		_prefab.Spawn(transform.position, transform.rotation);
+
+		// Use this only with Prefabs
+		_prefab.Spawn<Rigidbody>(transform.position, transform.rotation).isKinematic = true;
+	}
+}
+
+```
+
+How to return object to pool:
+```csharp
+using ToolBox.Pools;
+using UnityEngine;
+
+public class Spawner : MonoBehaviour
+{
+	[SerializeField] private GameObject _prefab = null;
+
+	public void Spawn()
+	{
+		// Use this only with Prefabs
+		var instance = _prefab.Spawn(transform.position, transform.rotation);
+
+		// Use this only with Instances of Prefab
+		instance.Despawn();
+	}
+}
+```
+
+How to use callbacks:
+```csharp
+using ToolBox.Pools;
+using UnityEngine;
+
+public class Health : MonoBehaviour, IPoolable
+{
+	[SerializeField] private float _maxHealth = 100f;
+
+	private float _health = 0f;
+
+	private void Awake() =>
+		_health = _maxHealth;
+
+	// IPoolable method
+	public void OnSpawn() =>
+		_health = _maxHealth;
+
+	// IPoolable method
+	public void OnDespawn() { }
+}
+```