WARNING: Almost all questions about development or app distribution are off topic here. See the FAQs for details. Xcode is Apple's official software development environment for Mac OS X and iOS
Questions relating to programming generally belong at http://stackoverflow.com where programming questions are best asked and answered.
Ask Different focuses on consumer use of release software (please - no beta software, no NDA topics) so basic questions like how to install or launch Xcode are fine here. Also, Automator and AppleScript questions that relate to Xcode are most welcome here.
If in doubt, the FAQ contains the latest guidance for Ask Different.