Add "app.json" for enabling "Deploy to Heroku" button.
Add "app.json" for enabling "Deploy to Heroku" button.

sample-by-jsakamoto/UsingPrologAsRuleEngineOnASPNET,sample-by-jsakamoto/UsingPrologAsRuleEngineOnASPNET,sample-by-jsakamoto/UsingPrologAsRuleEngineOnASPNET,sample-by-jsakamoto/UsingPrologAsRuleEngineOnASPNET