Create README.md

Author: photonstorm

plugins/spine/README.md

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+# Updating Spine
+
+1. Checkout the Esoteric Spine Runtimes repo to the `spine-runtimes` folder: https://github.com/EsotericSoftware/spine-runtimes/
+2. Run `npm i` inside the `spine-runtimes` folder.
+3. Add the `source-map` module: `npm i --save-dev source-map`.
+4. Run `npm run plugins.spine.runtimes` to build the new runtimes to the `plugins/spine/src/runtimes` folder.
+
+You can now build a new version of the Spine Plugin:
+
+5. `npm run plugin.spine.dist`.
+