Update FluentUI Tester README (#717)

* Update README.md

Update the URL that launches the FluentUI Tester on Windows readme.md file. The previous link launched a 404 not found page.

* Change files

* Rename readme.md to README.md

* Update README.md

Change file path back to README.md for Windows link

apps/fluent-tester/README.md

@@ -6,4 +6,4 @@
 - [Android](./../android/README.md)
 - [macOS](./../macos/README.md)
 - [Windows](./../windows/README.md)
-- [Win32](./../win32/README.md)
+- [Win32](./../win32/README.md)

change/@fluentui-react-native-tester-2021-06-04-09-49-18-patch-1.json

@@ -0,0 +1,8 @@
+{
+  "type": "none",
+  "comment": "Update README.md",
+  "packageName": "@fluentui-react-native/tester",
+  "email": "amdingler694@gmail.com",
+  "dependentChangeType": "none",
+  "date": "2021-06-04T13:49:18.367Z"
+}