chore(examples): add old api examples

example/src_oldapi/MultiFlows/index.tsx

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+import React, { useState, FC } from 'react';
+
+import ReactFlow, {
+  removeElements,
+  addEdge,
+  Background,
+  Elements,
+  Edge,
+  Connection,
+  ReactFlowProvider,
+} from 'react-flow-renderer';
+
+import './multiflows.css';
+
+const initialElements: Elements = [
+  { id: '1', type: 'input', data: { label: 'Node 1' }, position: { x: 250, y: 5 }, className: 'light' },
+  { id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 100 }, className: 'light' },
+  { id: '3', data: { label: 'Node 3' }, position: { x: 400, y: 100 }, className: 'light' },
+  { id: '4', data: { label: 'Node 4' }, position: { x: 400, y: 200 }, className: 'light' },
+  { id: 'e1-2', source: '1', target: '2', animated: true },
+  { id: 'e1-3', source: '1', target: '3' },
+];
+
+const Flow: FC = () => {
+  const [elements, setElements] = useState<Elements>(initialElements);
+  const onElementsRemove = (elementsToRemove: Elements) => setElements((els) => removeElements(elementsToRemove, els));
+  const onConnect = (params: Edge | Connection) => setElements((els) => addEdge(params, els));
+
+  return (
+    <ReactFlowProvider>
+      <ReactFlow elements={elements} onElementsRemove={onElementsRemove} onConnect={onConnect}>
+        <Background />
+      </ReactFlow>
+    </ReactFlowProvider>
+  );
+};
+
+const MultiFlows: FC = () => (
+  <div className="react-flow__example-multiflows">
+    <Flow />
+    <Flow />
+  </div>
+);
+
+export default MultiFlows;

example/src_oldapi/MultiFlows/multiflows.css

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+.react-flow__example-multiflows {
+  display: flex;
+  height: 100%;
+}
+
+.react-flow__example-multiflows .react-flow {
+  width: 100%;
+  height: 100%;
+}
+
+.react-flow__example-multiflows .react-flow:first-child {
+  border-right: 2px solid #333;
+}