Added basic character controller via importing Starter Assets from Unity.

Assets/Third Parties/Starter Assets/Runtime/Common/BasicRigidBodyPush.cs

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+using UnityEngine;
+
+public class BasicRigidBodyPush : MonoBehaviour
+{
+	public LayerMask pushLayers;
+	public bool canPush;
+	[Range(0.5f, 5f)] public float strength = 1.1f;
+
+	private void OnControllerColliderHit(ControllerColliderHit hit)
+	{
+		if (canPush) PushRigidBodies(hit);
+	}
+
+	private void PushRigidBodies(ControllerColliderHit hit)
+	{
+		// https://docs.unity3d.com/ScriptReference/CharacterController.OnControllerColliderHit.html
+
+		// make sure we hit a non kinematic rigidbody
+		Rigidbody body = hit.collider.attachedRigidbody;
+		if (body == null || body.isKinematic) return;
+
+		// make sure we only push desired layer(s)
+		var bodyLayerMask = 1 << body.gameObject.layer;
+		if ((bodyLayerMask & pushLayers.value) == 0) return;
+
+		// We dont want to push objects below us
+		if (hit.moveDirection.y < -0.3f) return;
+
+		// Calculate push direction from move direction, horizontal motion only
+		Vector3 pushDir = new Vector3(hit.moveDirection.x, 0.0f, hit.moveDirection.z);
+
+		// Apply the push and take strength into account
+		body.AddForce(pushDir * strength, ForceMode.Impulse);
+	}
+}

Assets/Third Parties/Starter Assets/Runtime/Common/BasicRigidBodyPush.cs.meta

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+  assetBundleName: 
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+  serializedVersion: 1
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+  packageVersion: 2.0.2
+  assetPath: Assets/Starter Assets/Runtime/Common/BasicRigidBodyPush.cs
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