Format build options doc. Minimal right now, can be fleshed out for 1.0
Format build options doc. Minimal right now, can be fleshed out for 1.0

cbeck88/cegui-mirror,RealityFactory/CEGUI,RealityFactory/CEGUI,cbeck88/cegui-mirror,RealityFactory/CEGUI,arkana-fts/cegui,RealityFactory/CEGUI,arkana-fts/cegui,arkana-fts/cegui,RealityFactory/CEGUI,cbeck88/cegui-mirror,arkana-fts/cegui,cbeck88/cegui-mirror,arkana-fts/cegui,cbeck88/cegui-mirror