Added module description with explanation of the functionality

README.md

@@ -0,0 +1,21 @@
+### What's the problem?
+
+That sometimes might be a case when your Magento content managers use the same images with assigning them to
+different products - and that may consume a lot of priceless server media storage. Especially if you're on
+a big number of SKUs, that'll become a real issue.
+
+### What to do?
+
+Our small extension helps to discover such duplicates in products' galleries, remove them and point the images to
+original path.
+
+### How to use?
+
+That's easy - `bin/magento catalog:images:remove-duplicates`
+
+**Warning**
+
+Please create dumps of below listed tables, for being able to revert changes if something goes wrong.
+
+- catalog_product_entity_media_gallery
+- catalog_product_entity_varchar