Resolve "Update readme"

Closes #1 (closed)

README.md

+# Firefox Install Instructions
+
+## Load Add-on in Firefox:
+
+1. Download firefox-sailpoint-structured-data-viewer.zip
+1. Open Firefox and navigate to about:debugging.
+1. Click on "This Firefox" (or "This Nightly" if you are using Firefox Nightly).
+1. Click on "Load Temporary Add-on".
+1. Select the zipped extension file.
+
+## Load Extenstion in Chrome / Edge
+
+1. Download chrome-edge-sailpoint-structured-data-viewer.zip
+1. Extract to a directory of your choosing
+1. Open Chrome/Edge and go to chrome://extensions/ or edge://extensions.
+1. Enable "Developer mode".
+1. Click "Load unpacked" and select your extension directory.