git-effort: add page (#6002)

pages/common/git-effort.md

@@ -0,0 +1,29 @@
+# git effort
+
+> Display how much activity a file has had, showing commits per file and "active days" i.e. total number of days that contributed to the file.
+> Part of `git-extras`.
+> More information: <https://github.com/tj/git-extras/blob/master/Commands.md#git-effort>.
+
+- Display each file in the repository, showing commits and active days:
+
+`git effort`
+
+- Display files modified by a specific number of commits or more, showing commits and active days:
+
+`git effort --above {{5}}`
+
+- Display files modified by a specific author, showing commits and active days:
+
+`git effort -- --author="{{username}}"`
+
+- Display files modified since a specific time/date, showing commits and active days:
+
+`git effort -- --since="{{last month}}"`
+
+- Display only the specified files or directories, showing commits and active days:
+
+`git effort {{path/to/file_or_directory1 path/to/file_or_directory2 ...}}`
+
+- Display all files in a specific directory, showing commits and active days:
+
+`git effort {{path/to/directory/*}}`