docs: Add Mopidy-Podcast-{gpodder.net,iTunes}
docs: Add Mopidy-Podcast-{gpodder.net,iTunes}

(cherry picked from commit 95a051abf8ff82b9b3f0484e2d343a6fc91fdfaa)

dbrgn/mopidy,diandiankan/mopidy,dbrgn/mopidy,jodal/mopidy,dbrgn/mopidy,liamw9534/mopidy,glogiotatidis/mopidy,pacificIT/mopidy,jmarsik/mopidy,tkem/mopidy,adamcik/mopidy,mopidy/mopidy,ZenithDK/mopidy,ZenithDK/mopidy,woutervanwijk/mopidy,rawdlite/mopidy,adamcik/mopidy,bencevans/mopidy,tkem/mopidy,quartz55/mopidy,jcass77/mopidy,hkariti/mopidy,vrs01/mopidy,adamcik/mopidy,ali/mopidy,pacificIT/mopidy,hkariti/mopidy,SuperStarPL/mopidy,quartz55/mopidy,glogiotatidis/mopidy,kingosticks/mopidy,diandiankan/mopidy,SuperStarPL/mopidy,kingosticks/mopidy,rawdlite/mopidy,bencevans/mopidy,ali/mopidy,mopidy/mopidy,rawdlite/mopidy,jcass77/mopidy,jmarsik/mopidy,tkem/mopidy,woutervanwijk/mopidy,bencevans/mopidy,jmarsik/mopidy,pacificIT/mopidy,swak/mopidy,ZenithDK/mopidy,quartz55/mopidy,pacificIT/mopidy,swak/mopidy,mokieyue/mopidy,jodal/mopidy,bacontext/mopidy,jmarsik/mopidy,bacontext/mopidy,ali/mopidy,glogiotatidis/mopidy,bacontext/mopidy,swak/mopidy,quartz55/mopidy,SuperStarPL/mopidy,glogiotatidis/mopidy,vrs01/mopidy,tkem/mopidy,diandiankan/mopidy,vrs01/mopidy,jodal/mopidy,hkariti/mopidy,diandiankan/mopidy,liamw9534/mopidy,dbrgn/mopidy,bacontext/mopidy,ali/mopidy,ZenithDK/mopidy,priestd09/mopidy,rawdlite/mopidy,priestd09/mopidy,kingosticks/mopidy,swak/mopidy,vrs01/mopidy,mokieyue/mopidy,jcass77/mopidy,hkariti/mopidy,mokieyue/mopidy,SuperStarPL/mopidy,mokieyue/mopidy,mopidy/mopidy,priestd09/mopidy,bencevans/mopidy