docs: add README instructions

README.md

@@ -1,3 +1,48 @@
 # ntfy-bridge
 
-Bridge for various implementations to publish to ntfy.
+Bridge for various implementations to publish to ntfy.
+
+## Installation
+
+Using go:
+
+```sh
+go install forge.babariviere.com/babariviere/ntfy-bridge@latest
+```
+
+Or using docker:
+
+```sh
+docker pull forge.babariviere.com/babariviere/ntfy-bridge:latest
+```
+
+Binaries are also avaiable in the [release section](https://forge.babariviere.com/babariviere/ntfy-bridge/releases).
+
+## Usage
+
+First, you need to create a configuration file. A sample one is provided [here](./config.example.scfg).
+
+For now, we have these handler types:
+- `flux`: handle notification from [Flux](https://fluxcd.io)
+- `discord_embed`: handle preformated notification from discord embeds (see [embed object](https://discord.com/developers/docs/resources/channel#embed-object))
+- `alertmanager`: handle notification from alertmanager using [webhook_config](https://prometheus.io/docs/alerting/latest/configuration/#webhook_config)
+
+Once you have created your config file, you can either put it in these directories:
+- `/etc/ntfy-bridge/config.scfg`
+- `$HOME/.ntfy-bridge/config.scfg`
+- `$HOME/.config/ntfy-bridge/config.scfg`
+- `config.scfg` (current directory)
+
+Then, you can simply run the binary with either the native binary:
+
+```sh
+./ntfy-bridge
+```
+
+Or via docker:
+
+```sh
+docker run -v config.scfg:/etc/ntfy-bridge/config.scfg -p 8080 forge.babariviere.com/babariviere/ntfy-bridge:latest
+```
+
+Sample config for kubernetes can be found in [./k8s/](./k8s/) directory.