Add troubleshooting for hidden .txt files (Windows) (#1087)

* Update entrypoint.sh

Added troubleshooting for new Windows installs (more info in my comment in issue #66).

* Update entrypoint.sh

fix formatting (indentation) of w10 troubleshooting addition.

bin/entrypoint.sh

@@ -32,6 +32,11 @@ function wechaty::errorBotNotFound() {
         `--volume="$(pwd)":/bot`
 
       this will let the container visit your current directory.
+      
+    2. Are you sure your .js/.ts files aren't .js.txt/.ts.txt?
+    
+      this could be a problem on new Windows installs (file 
+      extensions hidden by default).
 
     if you still have issue, please have a look at
       https://github.com/chatie/wechaty/issues/66