Add Linux installation info (#103)

* Add Linux installation info

Add a repology badge and mention the possibility to install via the package manager.

I believe this is a better approach than explicitly mentioning a repository, because it uses repology's database (and the list will remain updated).

* use tiny badge

The big badge is too big and could overflow in the following section. The tiny one will keep the same size as new packages are added.
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Nicola Smaniotto 2021-12-14 10:40:44 +01:00 committed by GitHub
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@ -63,6 +63,10 @@ Install devel packages for `SDL2` and `SDL2_mixer`.\
Compile with CMake; tested with GCC 10, Clang 11.\
To cross-compile for Windows, install a 64-bit version of mingw and its `SDL2` and `SDL2_mixer` distributions, then use the `mingwcc.cmake` toolchain.
[![Packaging status](https://repology.org/badge/tiny-repos/spacecadetpinball.svg)](https://repology.org/project/spacecadetpinball/versions)
Some distributions provide a package in their repository. You can use those for easier dependency management and updates.
### On macOS
* **Homebrew**: Install the `SDL2`, `SDL2_mixer` homebrew packages.