Added some bits about the various ways to get the source code for the SDK
Added some bits about the various ways to get the source code for the SDK

Signed-off-by: Erik de Bruin <c195b508e6f0c57aeafdb5e96947e2b79e6a4b40@ixsoftware.nl>

shyamalschandra/flex-sdk,apache/flex-sdk,shyamalschandra/flex-sdk,apache/flex-sdk,shyamalschandra/flex-sdk,shyamalschandra/flex-sdk,shyamalschandra/flex-sdk,apache/flex-sdk,apache/flex-sdk,apache/flex-sdk,shyamalschandra/flex-sdk,apache/flex-sdk