added logos

Author: joshua0308

assets/readme_logo.png

@@ -1,3 +1,7 @@
+<p align="center">
+  <img src ="./assets/readme_logo.png" width="200"/>
+</p>
+
 # Reactime
 
 [![GitHub](https://img.shields.io/github/license/oslabs-beta/reactime)](https://github.com/oslabs-beta/reactime)

readme.md

@@ -9,6 +9,7 @@
     "scripts": ["bundles/background.bundle.js"],
     "persistent": false
   },
+  "icons": { "48": "assets/icon48.png", "128": "assets/icon128.png" },
   "content_scripts": [
     {
       "matches": ["<all_urls>"],