Add Development.md, so I dont forget how to build this thing again

Development.md

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+### Build
+
+The build is intended to be as independent of XCode as humanly possible.
+
+`make install` builds and installs both the App and Extension (i.e. everything).
+
+All the needed build operations are defined in the [App](App/Makefile) and [Extension](Extension/Makefile) Makefiles.
+
+(If you're at all comfortable with the command line, use this method instead of the pkg installer.)
+
+### Releases
+
+WavTap's installer is distributed via [Github Releases](https://github.com/pje/WavTap/releases/new).
+
+Grab PackageMaker.app from the [Auxiliary Tools for XCode (Late July 2012)](http://adcdownload.apple.com/Developer_Tools/auxiliary_tools_for_xcode__late_july_2012/xcode44auxtools6938114a.dmg)
+
+Build the `pkg` bundler with PackageMaker.app, using Installer/WavTap.pmdoc
+
+### Versioning
+
+Strictly SemVer, obvi.
+
+App package identifier: `com.wavtap.app.WavTap`
+Extension package identifier: `com.wavtap.driver.WavTap`