added browswer support (#12587)

website/content/docs/browser-support.mdx

@@ -0,0 +1,18 @@
+---
+layout: docs
+page_title: Browser Support
+sidebar_title: Browser Support
+description: |-
+  List of browser suppport.
+---
+
+# Vault UI Browser Support
+
+Vault currently supports all 'evergreen' browsers, as they are generally on up-to-date versions. Therefore, the follow browsers are supported:
+
+- Chrome
+- Firefox
+- Safari
+- Microsoft Edge
+
+We do not support Internet Explorer 11 (IE 11). Vault follows a similar alignment with Microsoft's own stance on IE 11, found on their [support website](https://docs.microsoft.com/en-US/lifecycle/faq/internet-explorer-microsoft-edge).

website/data/docs-nav-data.json

@@ -11,7 +11,10 @@
   {
     "divider": true
   },
-
+  {
+    "title": "Browser Support",
+    "path": "browser-support"
+  },
   {
     "title": "Installing Vault",
     "path": "install"