Add doc for repository analytics

doc/user/analytics/index.md

@@ -39,6 +39,6 @@ The following analytics features are available at the project level:
 - [Code Review](code_review_analytics.md). **(STARTER)**
 - [Insights](../group/insights/index.md). **(ULTIMATE)**
 - [Issues](../group/issues_analytics/index.md). **(PREMIUM)**
-- Repository. **(STARTER)**
+- [Repository](repository_analytics.md).
 - [Value Stream](value_stream_analytics.md), enabled with the `cycle_analytics`
   [feature flag](../../development/feature_flags/development.md#enabling-a-feature-flag-in-development). **(STARTER)**

doc/user/analytics/repository_analytics.md

+---
+stage: Manage
+group: Analytics
+To determine the technical writer assigned to the Stage/Group associated with this page, see:
+  https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
+# Repository Analytics
+
+Get high-level overview of the project's Git repository.
+
+![Repository Analytics](img/repository_analytics_v13_0.png)
+
+## Availability
+
+Repository Analytics is part of [GitLab Community Edition](https://gitlab.com/gitlab-org/gitlab-foss). It's available to anyone who has permission to clone the repository.
+
+The feature requires:
+
+- An initialized Git repository.
+- At least one commit in the default branch (`master` by default).
+
+## Overview
+
+You can find Repository Analytics in the project's sidebar. To access the page, go to **{chart}** **Analytics > Repository**.
+
+NOTE: **Note:**
+Without a Git commit in the default branch, the menu item won't be visible.
+
+### Charts
+
+The data in the charts are updated soon after each commit in the default branch.
+
+Available charts:
+
+- Programming languages used in the repository
+- Commit statistics (last month)
+- Commits per day of month
+- Commits per weekday
+- Commits per day hour (UTC)