Add installation instructions for openSUSE Tumbleweed

Dependencies

• [2] ONXLUQLI Add install instructions for arch
• [*] SCSV2FNS Reboot

Change contents

• edit in src/installing.md at line 29
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  +

  + On openSUSE Tumbleweed, type:
• edit in src/installing.md at line 32
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  + ```

  + sudo zypper in clang-devel libopenssl-devel libsodium-devel libzstd-devel pkgconfig xxhash-devel

  + ```

  +
• edit in src/installing.md at line 91
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  +

  + ### openSUSE

  +

  + The stable version (0.12.2) is available in openSUSE Leap 15.2 and openSUSE

  + Tumbleweed repositories:
• edit in src/installing.md at line 97
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  + ```

  + sudo zypper install pijul

  + ```

  +

  + If you are interested in the development version (`1.0.0-alpha.X`), you can find

  + [a package](https://build.opensuse.org/package/show/devel:tools:scm/pijul) for

  + openSUSE Tumbleweed in the openSUSE Build Service:

  +

  + ```

  + sudo zypper addrepo -f -r https://download.opensuse.org/repositories/devel:/tools:/scm/openSUSE_Tumbleweed/devel:tools:scm.repo

  + sudo zypper install --allow-vendor-change pijul

  + ```

  +

  + Use the development version at your own risk. As soon as Pijul 1.0.0 is

  + published, the package will be updated and submitted to openSUSE Tumbleweed.

  +