Add a demo script to listen the events (#220)

Signed-off-by: Adi Bhagavath <[email protected]>

demo/src/listen-events.ts

@@ -0,0 +1,36 @@
+import * as Cord from "@cord.network/sdk";
+
+async function main() {
+  const networkAddress = process.env.NETWORK_ADDRESS
+    ? process.env.NETWORK_ADDRESS
+    : 'ws://127.0.0.1:9944'
+  //  const networkAddress = 'ws://127.0.0.1:9944'
+  Cord.ConfigService.set({ submitTxResolveOn: Cord.Chain.IS_IN_BLOCK })
+  await Cord.connect(networkAddress)
+
+  const api = Cord.ConfigService.get('api')
+
+  // Subscribe to system events
+  api.query.system.events((events) => {
+    // Loop through the array of events
+    events.forEach((record) => {
+      // Extract the phase, event type, and event data
+      const { event, phase } = record
+      const types = event.typeDef
+      const args = event.data.map((data) => data.toString())
+
+      // Print the event details
+      console.log(
+        `\nEvent: ${event.section}.${event.method} [${phase.toString()}]`
+      )
+      console.log(`\tParameters:`)
+      args.forEach((arg, index) => {
+        console.log(`\t\t${types[index].type}: ${arg}`)
+      })
+    })
+  })
+}
+
+main().catch((error) => {
+  console.error('Error:', error)
+})