[#376] [DC] Implementation Flow. Add flatpak description

README.md

@@ -21,6 +21,7 @@ That empowers users to effortlessly manage their finances while ensuring that no
 | ![Android](./docs/mockups/icons/android.png) Android (Huawei Gallery) | [fingrom_Android.aab](https://github.com/lyskouski/app-finance/releases/latest) | [App Gallery](https://appgallery.huawei.com/#/app/C109437079) | [![App Gallery](./docs/mockups/badges/huawei.png)](https://appgallery.huawei.com/#/app/C109437079) |
 | ![Linux](./docs/mockups/icons/linux.png) Linux (Snap Store)       | [fingrom_LinuxSnap.snap](https://github.com/lyskouski/app-finance/releases/latest) | [![Fingrom](https://snapcraft.io/fingrom/badge.svg)](https://snapcraft.io/fingrom) | [![Fingrom](./docs/mockups/badges/snap-store.png)](https://snapcraft.io/fingrom) |
 | ![Linux](./docs/mockups/icons/linux.png) Linux (Flathub)          | [[pending]](https://github.com/lyskouski/app-finance/issues/350) | [[pending]](https://github.com/lyskouski/app-finance/issues/350) | [[pending]](https://github.com/lyskouski/app-finance/issues/350) |
+| ![Linux](./docs/mockups/icons/linux.png) Linux (AppImage)         | [pending] | [pending] | [pending] |
 | ![Windows](./docs/mockups/icons/windows.png) Windows (Partner Center) | [fingrom_Windows.zip](https://github.com/lyskouski/app-finance/releases/latest) | [App Center: Fingrom](https://appcenter.ms/orgs/terCAD/apps/Fingrom) | [![Microsoft Store](./docs/mockups/badges/windows.png)](https://apps.microsoft.com/detail/fingrom/9NNPDJ2ST0HV) |
 | ![Web Browsers](./docs/mockups/icons/web.png) Web                      | [Fingrom](https://lyskouski.github.io/app-finance/) | [pending] | _(In Release)_ |
 

docs/implementation-flow/ch08-s04-linux.tex

@@ -124,3 +124,40 @@ \subsubsection{Linux Snap Store}
 \end{lstlisting}
 
 \img{distributing/linux-discover}{KDE Neon - Discover: Availability check}{img:d-snap}
+
+
+\subsubsection{Linux Flatpak Store}
+
+Flatpak (\href{https://flathub.org}{https://flathub.org}). is an attractive solution for distributing applications 
+because of its distribution-agnostic nature (it works seamlessly across different distributions with their 
+forward-compatibility by handling a dependency resolution problems).
+
+We may define a runtime that contains all the common libraries our application needs \issue{350}{}. Then, we build our 
+Flatpak on top of this runtime. What's powerful about this approach is that this same runtime is consistently used 
+across all distributions. Runtimes are reusable across multiple applications. In essence, the runtime acts as a 
+shared foundation for various applications, making it a practical solution for developers and users alike. 
+
+\begin{lstlisting}[language=terminal]
+# Install builder
+$ sudo apt install flatpak-builder
+# 'runtime' definition
+$ flatpak search org.freedesktop.Platform
+$ flatpak install flathub org.freedesktop.Platform//23.08 org.freedesktop.Sdk//23.08
+# ... or 'gnome', or 'kde'
+$ flatpak search org.gnome.Platform
+$ flatpak install flathub org.gnome.Platform//45 org.gnome.Sdk//45
+# Build project from the manifest
+$ flatpak-builder build-dir com.tercad.fingrom.yml --force-clean
+# Install application (clean if exists)
+$ flatpak-builder --user --install --force-clean build-dir com.tercad.fingrom.yml
+# Run application
+$ flatpak run com.tercad.fingrom
+\end{lstlisting}
+
+\noindent Build and installation is controlled by definitions from \q{com.tercad.fingrom.yml}-file
+(\href{https://docs.flatpak.org/en/latest/manifests.html}{https://docs.flatpak.org/en/latest/manifests.html}).
+
+
+\subsubsection{[TBD] Linux AppImage}
+
+...