docs(README): add installation instructions

README.md

@@ -6,6 +6,31 @@
 
 A **work in progress** Cli tool to generate preview images from a zmk .keymap file.
 
+
+## Installation
+
+You can download a pre compiled binary directly from the [releases](https://github.com/mrmarble/zmk-viewer/releases) for your OS/Architecture.
+### Linux/MacOS
+
+I made an [installation script](/scripts/install.sh) that should download the latest available version corresponding to your OS and architecture. `sudo` is needed to copy the binary to `/usr/local/bin`
+
+```sh
+curl -sL https://raw.githubusercontent.com/MrMarble/zmk-viewer/master/scripts/install.sh | sudo -E bash -
+# or with wget
+wget -O - https://raw.githubusercontent.com/MrMarble/zmk-viewer/master/scripts/install.sh | sudo -E bash -
+```
+
+### Windows
+
+Download the executable directly from the [releases](https://github.com/mrmarble/zmk-viewer/releases)
+
+### Others
+
+If you already have Go in your system you can use go install to build the binary without cloning the repo first.
+
+```sh
+go install github.com/mrmarble/zmk-viewer/cmd/zmk-viewer@latest # or target a specific version @v0.1.0
+```
 ## Usage
 
 ```shell
@@ -19,6 +44,7 @@ Arguments:
 Flags:
   -h, --help           Show context-sensitive help.
   -D, --debug          Enable debug mode
+      --version        Print version information and quit
 
   -f, --file=STRING    ZMK .keymap file
   -t, --transparent    Use a transparent background.