createrepo: add page (#7789)

Co-authored-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Co-authored-by: CleanMachine1 <78213164+CleanMachine1@users.noreply.github.com>

pages/linux/createrepo.md

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+# createrepo
+
+> Initializes an RPM repository in the given directory, including all XML and SQLite files.
+> More information: <https://manned.org/createrepo>.
+
+- Initialize a basic repository in a directory:
+
+`createrepo {{path/to/directory}}`
+
+- Initialize a repository, exclude test RPMs and display verbose logs:
+
+`createrepo -v -x {{test_*.rpm}} {{path/to/directory}}`
+
+- Initialize a repository, using SHA1 as the checksum algorithm, and ignoring symbolic links:
+
+`createrepo -S -s {{sha1}} {{path/to/directory}}`