chore: update link

README.md

@@ -4,4 +4,4 @@ As a regular user you must use the official integrated application through [Umbr
 
 ![Umbrel](https://user-images.githubusercontent.com/45034541/140373859-66b7fa6d-5eeb-4fc5-8608-d139e8677267.png)
 
-If you really want to tinker with this app, read [this](https://github.com/ln-markets/umbrel/blob/master/dev/README.MD) to know how to setup your env properly.
+If you really want to tinker with this app, read [this](https://github.com/ln-markets/umbrel/tree/master/dev/README.md) to know how to setup your env properly.

dev/README.md

@@ -0,0 +1,77 @@
+# Dev setup
+
+You must follow this if you want to work on this app.
+
+## Prerequisites:
+
+- [docker](https://docs.docker.com/get-docker/)
+- [docker-compose](https://docs.docker.com/compose/install/)
+- [jq](https://stedolan.github.io/jq/)
+
+## Install local env
+
+This environment is linked to the **regtest** version of LN Markets. **Meant only for LN Markets developers**.
+
+### Setting up the app:
+
+You must launch LN Markets local env beforehand.
+
+```shell
+ $> pnpm local:start
+```
+
+## Install testnet env
+
+This environment is linked to the **testnet** version of LN Markets. **Meant for development use only**.
+
+### Setting up the app:
+
+If it's the first time running the app in this mode, you must setup a channel between your node and LN Markets.
+
+```shell
+ $> pnpm testnet:init
+```
+
+This command will output you a wallet address that you must use to get tBTC in order to open a channel. You can get those via faucets, here is a small selection of them.
+
+|             tBTC Faucets              |
+| :-----------------------------------: |
+| https://coinfaucet.eu/en/btc-testnet/ |
+|  https://testnet-faucet.mempool.co/   |
+|    https://bitcoinfaucet.uo1.net/     |
+|                                       |
+
+You can check how much your wallet contains.
+
+```shell
+  $> pnpm lnd:balance
+```
+
+Now that you have money create a channel with LN Markets.
+
+```shell
+  $> pnpm lnd:create-channel AMOUNT
+```
+
+If it's not the first time simply start the env.
+
+```shell
+  $> pnpm testnet:start
+```
+
+In both case you'll have to unlock your wallet and restart the API to get access to your node!
+
+```shell
+  $> pnpm lnd:unlock
+  $> pnpm testnet:restart-api
+```
+
+## Services
+
+These following services ar now accessible on any web browser no matter which env you launched.
+
+| Service |            URL            |
+| :-----: | :-----------------------: |
+|   API   | http://localhost:8001/api |
+|  Front  |   http://localhost:3000   |
+|         |                           |