added LibreOffice

Software/LibreOffice.md

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+# LibreOffice
+LibreOffice is the global standard for Open-Source Office Software. 
+
+It is a cross-platform suite of software containing the following applications:
+
+- Writer
+   - Document creation and editing. Similar to Word.
+- Calc
+   - Spreadsheet work, similar to Excel.
+- Impress
+   - Designing Presentations, similar to Powerpoint.
+- Draw
+   - Diagram designer, similar to Visio, but also good for editing PDFs.
+- Base
+   - Database frontend, similar to Access, can interact with an number of the most popular databases engines.
+- Few others such a formula or chart designers, which are also integrated into other LibreOffice apps.
+
+## Install
+LibreOffice is installed by default on many distribution.
+
+If it isn't you can probably use your system's graphical software manager to install it.
+
+To install via command-line you can do the following:
+### Flatpak (universal)
+If you wish to install through flatpak ensure flatpak is setup, see [Flatpak](../Tools/Flatpak.md) for details if not.
+```sh
+flatpak install flathub org.libreoffice.LibreOffice
+```
+
+### Arch-based
+```sh
+sudo pacman -S libreoffice-fresh
+```
+
+### Debian/Mint/Ubuntu
+```sh
+sudo apt update
+sudo apt install libreoffice
+```
+
+### Fedora 
+```sh
+sudo dnf install libreoffice
+```