Add Compiling-From-Source

Compiling-From-Source.-.md

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+## Prerequisites
+- [.NET SDK][Dotnet] 8.0 or higher
+- Install [Git] or download this repository [manually][RepoClone].
+- If you are on Linux, you'll also need [fontconfig][Fontconfig] as Avalonia depends on it.
+
+## Steps
+- Download this repository.
+  - `git clone https://toastielab.dev/EllieBotDevs/EllieHub`
+- Navigate to `EllieHub/EllieHub`
+  - `cd EllieHub/EllieHub`
+- Execute `dotnet publish`. Tweak the build with any [compilation flags][DotnetPublishOptions] you want.
+  - Adding `-c Release` to your build is strongly encouraged as this will include compiler optimizations into your final binary.
+  - For reference, this is the command used to generate the official builds in this repository, where `<rid>` is the [Runtime Identifier][DotnetRid].
+    - `dotnet publish -c Release -r <rid> -o ~/build/EllieHub_<rid> --self-contained`
+
+[Dotnet]: https://dotnet.microsoft.com/en-us/download/dotnet
+[Git]: https://git-scm.com/downloads
+[Fontconfig]: https://www.freedesktop.org/wiki/Software/fontconfig/
+[RepoClone]: https://toastielab.dev/EllieBotDevs/EllieHub/archive/main.zip
+[DotnetPublishOptions]: https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-publish
+[DotnetRid]: https://learn.microsoft.com/en-us/dotnet/core/rid-catalog