CI for specification repository

[dzahariev]

CI for Documentation repository that executes the following tasks on each PR and merge:

• Execute static checks for:
  ** Empty files
  ** Misspelled words
  ** Common formatting issues in MD files
• Generate sequence diagrams (issue 10) and push them in the repository.

[dotchev]

One option is to reuse the checks from OSB spec
These are a bunch of bash scripts. The downside is that they are not portable and are harder to extend and maintain.

Another option is to use some more general tool like remark (JS).