Added arrow shower combat skill for archer player

UnityClient/.vsconfig

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+{
+  "version": "1.0",
+  "components": [
+    "Microsoft.VisualStudio.Workload.ManagedGame"
+  ]
+}

UnityClient/Assets/_DEV/Feature-Sample/CameraFacingBillboard.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class CameraFacingBillboard : MonoBehaviour
+{
+    private void Update()
+    {
+        Camera cam = Camera.main;
+
+        if (cam != null)
+        {
+            transform.LookAt(transform.position + cam.transform.rotation * Vector3.forward,
+            cam.transform.rotation * Vector3.up);
+        }
+        else
+        {
+            Debug.LogError("Main camera is NULL!");
+        }
+    }
+}

UnityClient/Assets/_DEV/Feature-Sample/Enemy.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Enemy : MonoBehaviour
+{
+    public int maxHealth = 1000;
+    public int currentHealth = 0;
+
+    public bool isAlive = true;
+    public bool resetHealthOnDeath = true;
+
+    public float healthResetDelay = 0.2f;
+
+    [SerializeField]
+    private RectTransform healthFill;
+
+    private Color defaultColor;
+    private Renderer renderer;
+
+    public float GetHealthPercentage()
+    {
+        return (float)currentHealth / maxHealth;
+    }
+
+    public void ResetHealth()
+    {
+        isAlive = true;
+        currentHealth = maxHealth;
+    }
+
+    public void ResetColor()
+    {
+        renderer.material.color = defaultColor;
+    }
+
+    public void ChangeColor(Color color, float resetDelay)
+    {
+        renderer.material.color = color;
+        Invoke("ResetColor", resetDelay);
+    }
+
+    public void TakeDamage(int value)
+    {
+        if (currentHealth > 0)
+        {
+            currentHealth -= value;
+            healthFill.localScale = new Vector3(GetHealthPercentage(), 1f, 1f);
+        }
+        else
+        {
+            isAlive = false;
+
+            if(resetHealthOnDeath)
+                Invoke("ResetHealth", healthResetDelay);
+        }
+    }
+    // Start is called before the first frame update
+    void Start()
+    {
+        renderer = GetComponent<Renderer>();
+        defaultColor = renderer.material.color;
+
+        ResetHealth();
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+
+    }
+}