add deploy to heroku button

README.md

@@ -2,6 +2,17 @@
 
 Custom endpoint to allow displaying Patreon's number of patrons or amount of pledges. It uses [shields.io's Endpoint feature](https://shields.io/#/endpoint).
 
+## ATTENTION
+
+Please deploy your own version of this on your own Heroku account. My version is
+hosted on Heroku Free Plan, and can be unavaialble as soon as it expires
+(usually in the last few days of the month).
+
+<a href="https://heroku.com/deploy?template=https://github.com/endel/shieldsio-patreon">
+  <img src="https://www.herokucdn.com/deploy/button.svg" alt="Deploy">
+</a>
+
+
 ## Usage:
 
 - Endpoint: `https://shieldsio-patreon.herokuapp.com/endel/pledges`

app.json

@@ -0,0 +1,7 @@
+{
+  "name": "Shields.io Patreon endpoint",
+  "description": "Shields.io endpoint to display amount of donations/patrons you have on Patreon",
+  "repository": "https://github.com/endel/shieldsio-patreon",
+  "keywords": ["shieldsio", "patreon"],
+  "env": {}
+}