Added SUPPORT.md file with slack info ✈️
Added SUPPORT.md file with slack info ✈️

no issue

- Adds a guide for how to get support 📖
- Committed at 38000ft ✈️

JohnONolan/Ghost,mohanambati/Ghost,bitjson/Ghost,kevinansfield/Ghost,TryGhost/Ghost,janvt/Ghost,acburdine/Ghost,BlueHatbRit/Ghost,cwonrails/Ghost,ErisDS/Ghost,cwonrails/Ghost,mohanambati/Ghost,TryGhost/Ghost,JohnONolan/Ghost,cwonrails/Ghost,JohnONolan/Ghost,Kikobeats/Ghost,mohanambati/Ghost,ErisDS/Ghost,acburdine/Ghost,dbalders/Ghost,Kikobeats/Ghost,Kikobeats/Ghost,chevex/undoctrinate,e10/Ghost,ErisDS/Ghost,Gargol/Ghost,BlueHatbRit/Ghost,kevinansfield/Ghost,acburdine/Ghost,dbalders/Ghost,janvt/Ghost,bitjson/Ghost,TryGhost/Ghost,dbalders/Ghost,Gargol/Ghost,kevinansfield/Ghost,e10/Ghost