ananicy-cpp: add page (#23628)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Ivan Baluta <ivanbaluta.dev@gmail.com>

pages/linux/ananicy-cpp.md

@@ -0,0 +1,20 @@
+# ananicy-cpp
+
+> Feature-rich C++ rewrite of the Ananicy auto-nice daemon for Linux.
+> More information: <https://gitlab.com/ananicy-cpp/ananicy-cpp>.
+
+- Output all currently parsed rules and rule files:
+
+`ananicy-cpp dump rules`
+
+- Output all configured process types:
+
+`ananicy-cpp dump types`
+
+- Output all current rules in JSON format:
+
+`ananicy-cpp dump rules --json`
+
+- Parse and validate custom rule files without applying them:
+
+`ananicy-cpp parse {{path/to/file.rules}}`