[Ubuntu] Add clang-format to the readme (#3081)

* Add clang-format to the readme

* Create a function to retrieve clang tool versions

* Add ClangFormatVersions to software report

* Add new line

* Resolve nitpicks

images/linux/scripts/SoftwareReport/SoftwareReport.Generator.ps1

@@ -40,6 +40,7 @@ $markdown += New-MDList -Style Unordered -Lines (@(
         (Get-CPPVersions),
         (Get-FortranVersions),
         (Get-ClangVersions),
+        (Get-ClangFormatVersions),
         (Get-ErlangVersion),
         (Get-MonoVersion),
         (Get-NodeVersion),