Update README.md

README.md

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-# eBayActualSoldPrice
+# eBay Actual Sold Price Extension
+
 An add-on/extension for Chrome and Firefox to see the actual sold price of an item on eBay.
+
+### Screenshot
+![Actual price](https://i.imgur.com/PXc8Vog.png)
+
+### How to install
+
+I have not published the extension yet, but you can install it manually:
+
+After downloading the zip file, extract it.
+
+##### Load the extension in Chrome & Opera
+1. Open Chrome/Opera browser and navigate to chrome://extensions
+2. Select "Developer Mode" and then click "Load unpacked extension..."
+3. From the browser, choose the folder that contains the files you extracted
+
+
+##### Load the extension in Firefox
+1. Open Firefox browser and navigate to about:debugging
+2. Click "Load Temporary Add-on" and from the file browser, choose the folder that contains the files you extracted