fossil-commit: add page (#7051)

pages/linux/fossil-commit.md

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+# fossil commit
+
+> Commit files to a Fossil repository.
+> More information: <https://fossil-scm.org/home/help/commit>.
+
+- Create a new version containing all the changes in the current checkout; user will be prompted for a comment:
+
+`fossil commit`
+
+- Create a new version containing all the changes in the current checkout, using the specified comment:
+
+`fossil commit --comment "{{comment}}"`
+
+- Create a new version containing all the changes in the current checkout with a comment read from a specific file:
+
+`fossil commit --message-file {{path/to/commit_message_file}}`
+
+- Create a new version containing changes from the specified files; user will be prompted for a comment:
+
+`fossil commit {{path/to/file1}} {{path/to/file2}}`