docs(core): introduce early draft of compilation docs

Compilation.md

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+# Compilation
+
+This document tries to explain the various steps needed to build espanso. (Work in progress).
+
+## Prerequisites
+
+These are the basic tools required to build espanso:
+
+* A recent Rust compiler. You can install it following these instructions: https://www.rust-lang.org/tools/install
+* A C/C++ compiler. There are multiple of them depending on the platform, but espanso officially supports the following:
+  * On Windows, you should use the MSVC compiler. The easiest way to install it is by downloading Visual Studio and checking "Desktop development with C++" in the installer: https://visualstudio.microsoft.com/
+  * On macOS, you should use the official build tools that come with Xcode. If you don't want to install Xcode, you should be able to download only the build tools by executing `xcode-select —install` and following the instructions.
+  * On Linux, you should use the default C/C++ compiler (it's usually GCC). On Ubuntu/Debian systems, you can install them with `sudo apt install build-essential`
+
+* Espanso heavily relies on [cargo make](https://github.com/sagiegurari/cargo-make) for the various packaging
+steps. You can install it by running:
+
+```
+cargo install --force cargo-make
+```
+
+## Linux
+
+Espanso on Linux comes in two different flavors: one for X11 and one for Wayland. 
+If you don't know which one to choose, follow these steps to determine which one you are running: https://unix.stackexchange.com/a/325972
+
+### AppImage
+
+The AppImage is a convenient format to distribute Linux applications, as besides the binary, 
+it also bundles all the required libraries.
+
+You can create the AppImage by running (this will work on X11 systems):
+
+```
+cargo make create-app-image --profile release
+```
+
+Or if you are on **Wayland**:
+
+```
+cargo make create-app-image --profile release --env NO_X11=true
+```
+
+You will find the resulting AppImage in the `target/linux/AppImage/out` folder.
+
+## Advanced
+
+Espanso offers a few flags that might be necessary if you want to further tune the resulting binary.
+
+### Disabling modulo (GUI features)
+
+Espanso includes a component known as _modulo_, which handles most of the graphical-related parts of the tool.
+For example, the Search bar or Forms are handled by it.
+
+If you don't want them, you can pass the `--env NO_MODULO=true` flag to any of the previous `cargo make` commands
+to remove support for it.
+
+Keep in mind that espanso was designed with modulo as a first class citizen, so the experience might be far from perfect without it.