chore(examples): add examples

example/src/CustomConnectionLine/ConnectionLine.tsx

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+import React, { FC } from 'react';
+import { ConnectionLineComponentProps } from 'react-flow-renderer';
+
+const ConnectionLine: FC<ConnectionLineComponentProps> = ({ sourceX, sourceY, targetX, targetY }) => {
+  return (
+    <g>
+      <path
+        fill="none"
+        stroke="#222"
+        strokeWidth={1.5}
+        className="animated"
+        d={`M${sourceX},${sourceY} C ${sourceX} ${targetY} ${sourceX} ${targetY} ${targetX},${targetY}`}
+      />
+      <circle cx={targetX} cy={targetY} fill="#fff" r={3} stroke="#222" strokeWidth={1.5} />
+    </g>
+  );
+};
+
+export default ConnectionLine;

example/src/CustomConnectionLine/index.tsx

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+import ReactFlow, {
+  Node,
+  addEdge,
+  Background,
+  BackgroundVariant,
+  Connection,
+  Edge,
+  useNodesState,
+  useEdgesState,
+} from 'react-flow-renderer';
+
+import ConnectionLine from './ConnectionLine';
+
+const initialNodes: Node[] = [{ id: '1', type: 'input', data: { label: 'Node 1' }, position: { x: 250, y: 5 } }];
+const initialEdges: Edge[] = [];
+
+const ConnectionLineFlow = () => {
+  const [nodes, , onNodesChange] = useNodesState(initialNodes);
+  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
+  const onConnect = (params: Connection | Edge) => setEdges((eds) => addEdge(params, eds));
+
+  return (
+    <ReactFlow
+      nodes={nodes}
+      edges={edges}
+      onNodesChange={onNodesChange}
+      onEdgesChange={onEdgesChange}
+      connectionLineComponent={ConnectionLine}
+      onConnect={onConnect}
+    >
+      <Background variant={BackgroundVariant.Lines} />
+    </ReactFlow>
+  );
+};
+
+export default ConnectionLineFlow;