chcat: add page (#18454)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/linux/chcat.md

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+# chcat
+
+> Change SELinux security category for files.
+> Categories provide an additional level of access control based on MCS (Multi-Category Security).
+> See also: `chcon`, `semanage`.
+> More information: <https://manned.org/chcat>.
+
+- List all available categories:
+
+`sudo chcat {{[-L|--list]}}`
+
+- Add a category to a file:
+
+`sudo chcat +{{CategoryName}} {{path/to/file}}`
+
+- Remove a category from a file:
+
+`sudo chcat -- -{{CategoryName}} {{path/to/file}}`
+
+- Set specific categories for a file (replacing existing ones):
+
+`sudo chcat {{CategoryName1,CategoryName2,...}} {{path/to/file}}`
+
+- Display the categories of a file:
+
+`ls {{[-Z|--context]}} {{path/to/file}}`
+
+- Remove all categories from a file:
+
+`sudo chcat {{[-d|--delete]}} {{path/to/file}}`