Add Competence center for geoinformation of the Kanton Solothurn

[WebSnke]

Thanks for the contribution! Below is a template that can make it easier when submitting your Organization:

Your Organization: Competence center for geoinformation of the Kanton Solothurn
GitHub Organization url: @sogis
Country/Locality: Switzerland
Link: http://agi.so.ch/

Inclusion requirements:

• Referenced account is an Organization not a User^
• If this is a government project, your Organization's description should include a reference to your country/agency.
• Make sure your Organization includes at least one public repository
• Please also include a URL for your organization that links back to your organization or agency homepage.

❤️ GitHub Government Contributors

[WebSnke]

@mlinksva
Could you take a look at my pull requests and merge them?