Create README.md

Author: judgej

README.md

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+# wc-api-custom-meta
+WordPress/WooCommerce plugin to support custom meta fields through the product API
+
+A very simple plugin that allows you to create, update or remove custom meta fields when
+managing prducts through the WooCommerce API.
+
+It is necessary to install this plugin on the WC site providing the API.
+I have raised a ticket asking whether this can ever be a core feature of WooCommerce,
+but the ticket has been rejected (rather rudely):
+
+https://github.com/woothemes/woocommerce/issues/7593
+
+It may come back, but this plugin fills a gap in the meantime.
+
+To use it, add elements to the product array passed to the `products` entrypoint. Each element is
+an array, with examples that follow:
+
+~~~php
+$product = [
+    'product' => [
+        'title' => 'Foobar',
+        ...
+        'custom_meta' => [
+            'my_custom_field_name' => 'my custom value',
+        ],
+        'remove_custom_meta' => [
+            'remove_all_instances_of_this_field_name',
+            'remove_just_one_value_of_this_field_name' => 'this is the value',
+        ],
+    ]
+]
+~~~
+
+That's it. Make sure those elements are in yoru REST API request, and this plugin is installed at the other end,
+and you can set any meta fields you like.
+
+I have not tested this with anything other than strings, so be wary that the behaviour storing otehr data structures
+in metafields are *undefined* at present.