Create README.md

Author: ruigomeseu

README.md

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+# Lightning payments using OpenNode
+
+In this workshop we will be creating a public message board where every message is paid for using Lightning.
+
+Check out what we will end up with: [Demo Message Board](https://opennode-workshop-final--ruigomes.repl.co/)
+
+## Working on Bitcoin's Testnet
+
+This workshop runs on the Lightning Network Testnet.
+To easily pay for testnet Lightning invoices, check out the [HTLC.me wallet](https://htlc.me).
+
+Please be warned that API keys generated on a regular OpenNode account will *not* work on testnet.
+
+You have to create a specific account on OpenNode Dev - https://dev.opennode.co.
+If you can see the "Dev Environment" tag next to the OpenNode logo you're in the right place!
+
+> Hint: If you'd like to run this app on mainnet instead, create a regular OpenNode account at https://opennode.co/signup and change the API base URL from https://**dev-api**.opennode.co to https://**api**.opennode.co
+
+## Online IDE
+
+You can start working on this project immediately using Repl.it.
+
+The project is hosted at [https://repl.it/@ruigomes/opennode-workshop](https://repl.it/@ruigomes/opennode-workshop).
+
+Fork it and start playing around with it.
+
+## Got stuck?
+
+If you get stuck at any point during the workshop, feel free to browse this repository branches to quickly get up to speed.
+
+Here are the solutions for each step of the workshop:
+
+- [Creating invoices ⚡️](../../tree/02-creating-invoices)
+- [Checking for payments 💵](../../tree/03-checking-payments)
+- [Validating callbacks 🕵️‍♂️](../../tree/04-validating-callbacks)
+- [Spicing it up 🌶](../../tree/05-spice-it-up)
+
+Pro-tip: Use the "Compare" feature on GitHub to quickly identify what has been changed in each step!
+
+## Other questions?
+
+Feel free to contact us using our live chat at https://opennode.co or via email at [email protected]!