Add Vale with Google style guide

Author: tothmano

.vale.ini

@@ -0,0 +1,8 @@
+StylesPath = "vale/styles"
+
+MinAlertLevel = suggestion
+
+Packages = Google
+
+[*.mdx]
+BasedOnStyles = Vale, Google

README.md

@@ -30,3 +30,8 @@ Install our Github App to autopropagate changes from youre repo to your deployme
 
 - Mintlify dev isn't running - Run `mintlify install` it'll re-install dependencies.
 - Page loads as a 404 - Make sure you are running in a folder with `mint.json`
+
+npm i # install deps
+npm run mintlify dev # build mintlify locally
+npm run vale sync # sync packages defined in .vale.ini
+npm run vale . # check all included files in subfolders