docs: ingress-kong README added

Signed-off-by: Mattia Lavacca <[email protected]>

pkg/i2gw/providers/ingresskong/README.md

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+# Ingress Kong Provider
+
+The project supports translating ingress-kong specific annotations.
+
+Current supported annotations:
+
+- `konghq.com/methods`: If specified, the values of this annotation are used to
+  perform method matching on the associated ingress rules. Multiple methods can
+  be specified by separating values with commas. Example: `konghq.com/methods: "POST,GET"`.
+- `konghq.com/headers.*`: If specified, the values of this annotation are used to
+  perform header matching on the associated ingress rules. The header name is specified
+  in the annotation key after `.`, and the annotations value can contain multiple
+  header values separated by commas. All the header values for a specific header
+  name are intended to be ORed. Example: `konghq.com/headers.x-routing: "alpha,bravo"`.
+
+If you are reliant on any annotations not listed above, please open an issue.