Add entry for new plugin (#219)

_repo/inventree-test-statistics.md

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+---
+name: inventree-test-statistics
+author: SchrodingersGat
+license: MIT
+open_source: true
+stable: true
+maintained: true
+pypi: true
+package_name: inventree-test-statistics
+github: https://github.com/inventree/inventree-test-statistics
+issue_tracked: https://github.com/inventree/inventree-test-statistics/issues
+website: https://inventree.org
+categories: Reporting
+tags: test report data
+---
+
+Test Statistics for InvenTree
+
+A plugin which generates test statistics for parts in InvenTree
+
+![](/assets/plugins/inventree_test_statistics.png)
+
+## Installation
+
+The easiest way to install the plugin is via the InvenTree user interface.
+
+Alternatively, you can install the plugin manually as follows:
+
+```
+pip install inventree-test-statistics
+```
+
+
+## Documentation
+
+Refer to the [plugin documentation](https://github.com/inventree/inventree-test-statistics) for further instructions and information.