[orx-compute-graph] Add compute graph code

orx-compute-graph-nodes/README.md

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+# orx-compute-graph-nodes
+
+A collection of nodes that can be used with orx-computer-graph.
+
+## List of nodes
+
+### Multi-platform
+
+Name            | Description           | Inputs | Outputs
+----------------|-----------------------|--------|---------
+`filterNode`    | Wrap around a `Filter`|        | `image`
+`fitImageNode`  | Fit image to window bounds | `image` | `image`
+
+### JVM only
+
+Name            | Description       | Inputs | Outputs
+----------------|-------------------|--------|---------
+`drawCacheNode` | Cache drawing in an internal color buffer, commonly used as the final stage node | | `image`
+`dropImageNode` | Listen for window file drop events | | `image`
+
+
+