Oneclick deploy button (#2)

* Update README.md

* Add app.json

* Update README.md

* Add files via upload

* Update README.md

* Update README.md

Procfile

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+web: ./node_modules/.bin/next start -p $PORT

README.md

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 # Mock SAML from BoxyHQ
 
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https%3A%2F%2Fgithub.com%2Fboxyhq%2Fmock-saml&env=APP_URL,ENTITY_ID&envDescription=APP_URL%20(Usually%20https%3A%2F%2F%3Cproject-name%3E.vercel.app)%20can%20be%20set%20after%20deployment%20from%20the%20project%20dashboard.%20Set%20to%20''%20if%20not%20applicable.&envLink=https%3A%2F%2Fgithub.com%2Fboxyhq%2Fmock-saml%2Fblob%2Fmain%2F.env.example&project-name=mock-saml)
+
 Mock SAML is a SAML 2.0 IdP for development and testing the SAML SSO integration.
 
 Try [Mock SAML](https://mocksaml.com/)

app.json

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+{
+  "name": "Mock SAML",
+  "description": "Mock SAML is a SAML 2.0 IdP for development and testing the SAML SSO integration.",
+  "repository": "https://github.com/boxyhq/mock-saml",
+  "logo": "https://boxyhq.com/img/logo.png",
+  "keywords": ["saml", "saml2", "saml-idp", "mock-saml-idp", "test-saml", "saml-testing", "fake-saml-idp"],
+  "env": {
+    "APP_URL": {
+      "description": "Public root URL of the Mock SAML installation. Replace <HEROKU_APP_NAME> with 'App name' from above.",
+      "value": "https://<HEROKU_APP_NAME>.herokuapp.com"
+    },
+    "ENTITY_ID": {
+      "description": "Identity Provider entity ID.",
+      "value": "https://mocksaml.com/entityid"
+    }
+  },
+  "success_url": "/"
+}