update readme

Author: Khalil Charfi

README.md

@@ -1,4 +1,4 @@
-![sci-trick_chrome_extension_master_branch](https://cloud.githubusercontent.com/assets/4891848/12380662/97fad76e-bd78-11e5-8c82-7135a5c315c3.png)Sci-trick
+![sci-trick_chrome_extension_master_branch](assets/logo.png)Sci-trick
 ==========
 
 Chrome extension that appends ".sci-hub.bz" to active tab domain, allowing free access to scientific articles.
@@ -14,6 +14,7 @@ You can load it as an unpacked extension in developer mode on Chrome. Follow thi
 1. download and unzip this repo: `https://github.com/hamdiBh/sci-trick/archive/master.zip`. Take note where you unzipped it.
 2. Open Chrome and access `chrome://extensions`, or just open the menu -> settings -> extensions.
 3. Check the developer mode in upper right.
+   ![sci-trick_chrome_extension_master_branch](assets/load_extension.png)
 4. Click "Load unpacked extension" button
 5. Select the folder into which you unzipped **Sci-trick** and click "Open".
 6. We're done. The extension should be available as if installed from Chrome store.