Created drag indicator

The drag indicator shows the user roughly how much force will be applied to the planet.

Assets/Scripts/DragIndicatorController.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+public class DragIndicatorController : MonoBehaviour
+{
+    private new Camera camera;
+    private Vector2 startPos, endPos;
+
+    private LineRenderer lr;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        camera = Camera.main;
+        lr = gameObject.GetComponent<LineRenderer>();
+        startPos = endPos = Vector2.zero;
+        lr.positionCount = 2;
+        lr.material.color = Color.black;
+        lr.enabled = false;
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        if (!EventSystem.current.IsPointerOverGameObject())
+        {
+            if (Input.GetMouseButtonDown(0))
+            {
+                lr.enabled = true;
+                startPos = camera.ScreenToWorldPoint(Input.mousePosition);
+                lr.SetPosition(0, startPos);
+            }
+            if (Input.GetMouseButton(0))
+            {
+                endPos = camera.ScreenToWorldPoint(Input.mousePosition);
+                lr.SetPosition(1, endPos);
+            }
+            if (Input.GetMouseButtonUp(0))
+            {
+                lr.enabled = false;
+            }
+        }
+    }
+}