Rolling stocktake plugin (#251)

* Add plugin entry

* Add blog entry

* Fix internal link

_repo/inventree-rolling-stocktake.md

@@ -0,0 +1,33 @@
+---
+name: inventree-rolling-stocktake
+author: SchrodingersGat
+license: MIT
+open_source: true
+stable: true
+maintained: true
+pypi: true
+package_name: inventree-rolling-stocktake
+github: https://github.com/inventree/rolling-stocktake-plugin
+issue_tracked: https://github.com/inventree/rolling-stocktake-plugin/issues
+website: https://inventree.org
+categories: Stock
+tags: stock dashboard inventory
+---
+
+Rolling Stocktake for InvenTree
+
+A plugin which provides a rolling stocktake mechanism for InvenTree.
+
+## 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-rolling-stocktake
+```
+
+## Documentation
+
+Refer to the [plugin documentation](https://github.com/inventree/rolling-stocktake-plugin) for further instructions and information.