add GNU social readme file
add GNU social readme file

Piratas/tortuga,foocorp/gnu-social,sikevux/bsk-social,chimo/social,sikevux/bsk-social,furtherfield/gnu-social,eXcomm/gnu-social,chimo/social,bankonme/gnu-social,foocorp/gnu-social,sikevux/bsk-social,chimo/social,furtherfield/gnu-social,faulteh/gnu-social,studio666/gnu-social,eXcomm/gnu-social,charnimda/lgbtpzn-social,eXcomm/gnu-social,eXcomm/gnu-social,furtherfield/gnu-social,furtherfield/gnu-social,Piratas/tortuga,faulteh/gnu-social,bankonme/gnu-social,gnusocial/mainline,charlycoste/StatusNet,charlycoste/StatusNet,gnusocial/mainline,gnusocial/mainline,foocorp/gnu-social,studio666/gnu-social,bankonme/gnu-social,Piratas/tortuga,gnusocial/mainline,Piratas/tortuga,faulteh/gnu-social,charnimda/lgbtpzn-social,sikevux/bsk-social,studio666/gnu-social,faulteh/gnu-social,charnimda/lgbtpzn-social,charlycoste/StatusNet,studio666/gnu-social,bankonme/gnu-social