Grenades

[+] added
+ grenade.cs script
+ grenades can be thrown
+ grenades "explode" and spawn "explosion" (currently only a 50% transparent cube)

- NEEDS TO BE TESTED => BUG FIXED

Assets/Scripts/Weapons/Grenade.cs

@@ -0,0 +1,51 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Grenade : MonoBehaviour
+{
+    [SerializeField] GameObject explodeParticle;
+    [SerializeField] Weapon weapon; 
+    private float countdown;
+
+    void Start() {
+        countdown = weapon.Timer;
+    }
+
+    void Update() {
+        // If grenade has been thrown and countdown is over 0 and grenade has not exploded yet
+        if (weapon.HasBeenThrown && !weapon.HasExploded) {
+            // Decrease timer by 1 second
+            countdown -= Time.deltaTime;
+            // If countdown get to 0... BOOM!:
+            if(countdown <= 0) {
+                // Lets grenade explode
+                Explode();
+            }
+        }
+    }
+
+
+    /* - Spawn explosion particles and add force to nearby objects - */
+    private void Explode() {
+        // Spawns explosion particle
+        GameObject spawnedExplosion = Instantiate(explodeParticle, transform.position, transform.rotation);
+        // Destroys explosion particle after on second
+        Destroy(spawnedExplosion, 1);
+        // Gets all collider that are in a sphere around the grenade
+        Collider[] colliders = Physics.OverlapSphere(transform.position, weapon.GrenadeRadius);
+        // Iterate over all colliders found in radius
+        foreach(Collider nearbyObject in colliders) {
+            // Get Rigidbody from nearby object and...
+            Rigidbody rb = nearbyObject.GetComponent<Rigidbody>();
+            // if rigidbody exists...
+            if(rb != null) {
+                // adds force to nearby objects
+                rb.AddExplosionForce(weapon.ExplosionForce, transform.position, weapon.GrenadeRadius);
+            }
+        }
+        weapon.HasExploded = true;
+        // Destroys grenade
+        Destroy(gameObject);
+    }
+}