Android compatability

Author: thinkingserious

TROUBLESHOOTING.md

@@ -11,6 +11,7 @@ If you can't find a solution below, please open an [issue](https://github.com/se
 * [Versions](#versions)
 * [Environment Variables and Your SendGrid API Key](#environment)
 * [Using the Package Manager](#package-manager)
+* [Android Compatibility](#android)
 
 <a name="migrating"></a>
 ## Migrating from v2 to v3
@@ -88,4 +89,11 @@ repositories {
   mavenCentral()
 }
 ...
-```
+```
+
+<a name="android"></a>
+## Android Compatibility
+
+Since Android SDK 23, HttpClient is no longer supported. Some workarounds can be found [here](http://stackoverflow.com/questions/32153318/httpclient-wont-import-in-android-studio).
+
+We have an issue to remove that dependency [here](https://github.com/sendgrid/java-http-client/issues/2), please upvote to move it up the queue.