Add link to description of docs directory. (#310)
Add link to description of docs directory. (#310)

The content of the docs directory is described in detail in the x-api CONTRIBUTING guide.

rpottsoh/x-common,ErikSchierboom/x-common,kgengler/x-common,petertseng/x-common,exercism/x-common,kgengler/x-common,ErikSchierboom/x-common,jmluy/x-common,jmluy/x-common,Vankog/problem-specifications,Vankog/problem-specifications,rpottsoh/x-common,jmluy/x-common,exercism/x-common,petertseng/x-common