Added readme and PM2 configuration

README.md

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+# NotificationLatch
+
+Filters notifications so that each one is only sent once until it is reactivated. Designed for use with Domoticz. At the time of writing only Pushover is supported as a target transport.
+
+## Installing
+
+Install Node.js, at least the current LTS version.
+
+Install the dependencies and build the frontend:
+```
+npm install
+cd frontend
+npm install
+npm run build
+cd ..
+```
+Install PM2 and run the backend service:
+```
+npm install pm2 -g
+pm2 startup
+pm2 start .\ecosystem.config.js
+pm2 save
+```
+
+## Configuring Domoticz
+
+Go to Setup - Settings - Notifications. Enable Custom HTTP/Action and fill in the following information: 
+
+| Field | Value |
+|--|--|
+| URL/Action | ```http://localhost:3369/api/notification``` |
+| POST Data: | ```subject=#SUBJECT&message=#MESSAGE&priority=#PRIORITY``` |
+| POST Content-Type: | ```application/x-www-form-urlencoded``` |
+| POST Headers: | ```Authorization: Bearer <authToken from config.js>``` |

ecosystem.config.js

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+module.exports = {
+  apps : [{
+    name   : "NotificationLatch",
+    script : "./index.js"
+  }]
+}