Add license for client[s]

License: GNU GPLv3
This license applies to client[s] and other sources except library and
binding[s]
Add license for library and binding[s]

License: GNU LGPLv3
This license applies to library and binding[s]
Add license links
Clarify licenses
Merge branch 'dev/license' into develop
Add project guidelines
Merge branch 'dev/readme' into develop
Ignore Vim swap files
Ignore archives
Ignore build directories
Ignore backup files
Merge branch 'dev/gitignore' into develop
Add project branches guideline
Merge branch 'dev/readme' into develop