feat: created basic manifest.json to get started

Author: kiing-dom

README.md

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+# leetcode tracker browser extension

manifest.json

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+{
+    "manifest_version" : 3,
+    "name": "LeetCode Tracker",
+    "version": "0.1.0",
+    "descriptin": "Track your leetcode activity to improve faster",
+    "permissions": ["storage", "tabs", "activeTab", "scripting"],
+    "host_permissions": ["https://leetcode.com/*"],
+    "background": {
+        "service_worker": "background.js"
+    },
+    "action": {
+        "default_popup": "popup.html",
+        "default_icon": "placeholder.png"
+    },
+    "content_scripts": [
+        {
+            "matches": ["https://leetcode.com/*"],
+            "js": ["content.js"]
+        }
+    ]
+}