Add image for Android SDK Manager 'gear' icon.
Also mention installing android.jar.
*Actually* fix images/vswin-options-dialog.png path?
Fix typo in image path
Add images for JDK-11-Warning.md docs.
Why do we need JDK-11? What problems does JDK-11 cause? How do we install JDK-11?
Created JDK-11 Warning (markdown)