mh_metric: add page (#7912)

pages/common/mh_metric.md

@@ -0,0 +1,24 @@
+# mh_metric
+
+> Calculate and enforce code metrics for MATLAB or Octave code.
+> More information: <https://misshit.org>.
+
+- Print the code metrics for the specified files:
+
+`mh_metric {{path/to/file1.m path/to/file2.m ...}}`
+
+- Print the code metrics for the specified Octave files:
+
+`mh_metric --octave {{path/to/file1.m path/to/file2.m ...}}`
+
+- Print the code metrics for the specified directory recursively:
+
+`mh_metric {{path/to/directory}}`
+
+- Print the code metrics for the current directory:
+
+`mh_metric`
+
+- Print the code metrics report in HTML or JSON format:
+
+`mh_metric --{{html|json}} {{path/to/output_file}}`