docs: add code sample of manually import modules in echarts v5 (#407)

README.md

@@ -63,6 +63,98 @@ import ReactECharts from 'echarts-for-react';  // or var ReactECharts = require(
 
 Import ECharts.js modules manually to reduce bundle size
 
+**With Echarts.js v5:**
+
+```ts
+import React from 'react';
+// import the core library.
+import ReactEChartsCore from 'echarts-for-react/lib/core';
+// Import the echarts core module, which provides the necessary interfaces for using echarts.
+import * as echarts from 'echarts/core';
+// Import charts, all with Chart suffix
+import {
+  // LineChart,
+  BarChart,
+  // PieChart,
+  // ScatterChart,
+  // RadarChart,
+  // MapChart,
+  // TreeChart,
+  // TreemapChart,
+  // GraphChart,
+  // GaugeChart,
+  // FunnelChart,
+  // ParallelChart,
+  // SankeyChart,
+  // BoxplotChart,
+  // CandlestickChart,
+  // EffectScatterChart,
+  // LinesChart,
+  // HeatmapChart,
+  // PictorialBarChart,
+  // ThemeRiverChart,
+  // SunburstChart,
+  // CustomChart,
+} from 'echarts/charts';
+// import components, all suffixed with Component
+import {
+  // GridSimpleComponent,
+  GridComponent,
+  // PolarComponent,
+  // RadarComponent,
+  // GeoComponent,
+  // SingleAxisComponent,
+  // ParallelComponent,
+  // CalendarComponent,
+  // GraphicComponent,
+  // ToolboxComponent,
+  TooltipComponent,
+  // AxisPointerComponent,
+  // BrushComponent,
+  TitleComponent,
+  // TimelineComponent,
+  // MarkPointComponent,
+  // MarkLineComponent,
+  // MarkAreaComponent,
+  // LegendComponent,
+  // LegendScrollComponent,
+  // LegendPlainComponent,
+  // DataZoomComponent,
+  // DataZoomInsideComponent,
+  // DataZoomSliderComponent,
+  // VisualMapComponent,
+  // VisualMapContinuousComponent,
+  // VisualMapPiecewiseComponent,
+  // AriaComponent,
+  // TransformComponent,
+  // DatasetComponent,
+} from 'echarts/components';
+// Import renderer, note that introducing the CanvasRenderer or SVGRenderer is a required step
+import {
+  CanvasRenderer,
+  // SVGRenderer,
+} from 'echarts/renderers';
+
+// Register the required components
+echarts.use(
+  [TitleComponent, TooltipComponent, GridComponent, BarChart, CanvasRenderer]
+);
+
+// The usage of ReactEChartsCore are same with above.
+<ReactEChartsCore
+  echarts={echarts}
+  option={this.getOption()}
+  notMerge={true}
+  lazyUpdate={true}
+  theme={"theme_name"}
+  onChartReady={this.onChartReadyCallback}
+  onEvents={EventsDict}
+  opts={}
+/>
+```
+
+**With Echarts.js v3 or v4:**
+
 ```ts
 import React from 'react';
 // import the core library.