Add Compiling on *NIX systems

Compiling-on-%2ANIX-systems.md

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+_Lambda has not been compiled on macOS at the time of writing. If you have a macOS system and you want to give some information, please get in touch._
+
+Compiling Lambda on *NIX systems consists of installing the required dependencies, cloning the repository and building Lambda.
+
+## Dependencies
+
+You need a Go compiler, at the time of writing 1.25.5. Depending on your platform Go may be able to fetch and compile a newer version even if you are using a version below 1.25.5.
+
+Almost all *NIX distributions have Go in their repositories. If for whatever reason you cannot use those then you can get Go from the [official website](https://go.dev/).
+
+A C compiler is also required because Lambda uses GTK4.
+
+The following dependencies are required to be installed before compilation:
+
+- glib-2.0
+- gobject-2.0
+- cairo
+- cairo-gobject
+- gio-2.0
+- gobject-introspection
+- gdk-pixbuf-2.0
+- graphene-gobject-1.0
+- graphene-1.0
+- gtk4
+
+Some of these packages may be listed under different names on different distributions.
+
+If you are running a modern X11/Wayland system with GTK apps, then all of these packages should already be installed, and simply installing `gtk4` will suffice. If not, you can install them with your local package manager.
+
+Other than the GTK4-related dependencies, no other dependencies are required.
+
+## Cloning
+
+```bash
+git clone https://forge.sunglocto.net/lambda/
+```
+
+## Building
+
+If you are not compiling Lambda in order to test a code change, or are doing so for regular usage, you should strip debug information by using the -s -w flags:
+
+```bash
+go build -ldflags "-s -w"
+```
+
+Otherwise, simply run `go build`.