Create renovate.md

copied from Ocramius with some changes

renovate.md

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+# Renovate integration copied from [`Ocramius`](https://github.com/Ocramius/)
+
+Repositories under the [`WebProject-xyz/`](https://github.com/WebProject-xyz/) scope receive regular dependency
+upgrades through [renovate](https://github.com/renovatebot/renovate/tree/f50e685fe425ce9c4dfcf439d6edacb4906c49e3),
+which automates the heavy lifting of uplading lock files, supported dependency ranges, etc.
+
+This is defined in [`renovate-config.json`](./renovate-config.json), and imported in all applicable
+repositories in the organization.
+
+The configuration is heavily inspired by the
+[`Ocramius/.github` one](https://github.com/Ocramius/.github/blob/master/renovate-config.json).
+
+To use this configuration, create a [`renovate.json`](./renovate.json) file in the repository where it should be active:
+
+```json
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>WebProject-xyz/.github:renovate-config"
+  ]
+}
+```
+
+Please note that this file will change according to **MY OWN** needs: no BC guaranteed. I endorse that
+you copy the configuration and adapt it yourself, should you need it.