add example from readme

example/bootstrap.js

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+const dht = require('../')
+
+// Set ephemeral: true so other peers do not add us to the peer list, simply bootstrap
+const bootstrap = dht({ ephemeral: true })
+
+bootstrap.listen(10001)

example/find.js

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+const dht = require('../')
+const crypto = require('crypto')
+
+const hex = process.argv[2]
+const node = dht({ ephemeral: true, bootstrap: ['localhost:10001'] })
+
+node.query('values', Buffer.from(hex, 'hex'))
+  .on('data', function (data) {
+    if (data.value && sha256(data.value).toString('hex') === hex) {
+      // We found the value! Destroy the query stream as there is no need to continue.
+      console.log(hex, '-->', data.value.toString())
+      this.destroy()
+    }
+  })
+  .on('end', function () {
+    console.log('(query finished)')
+  })
+
+function sha256 (val) {
+  return crypto.createHash('sha256').update(val).digest()
+}

example/insert.js

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+const dht = require('../')
+const crypto = require('crypto')
+
+// Set ephemeral: true as we are not part of the network.
+const node = dht({ ephemeral: true, bootstrap: ['localhost:10001'] })
+const val = Buffer.from(process.argv[2])
+
+node.update('values', sha256(val), val, function (err, res) {
+  if (err) throw err
+  console.log('Inserted', sha256(val).toString('hex'))
+})
+
+function sha256 (val) {
+  return crypto.createHash('sha256').update(val).digest()
+}

example/network.js

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+const dht = require('../')
+const crypto = require('crypto')
+
+// Let's create 100 dht nodes for our example.
+for (var i = 0; i < 100; i++) createNode()
+
+function createNode () {
+  const node = dht({
+    bootstrap: [
+      'localhost:10001'
+    ]
+  })
+
+  const values = new Map()
+
+  node.command('values', {
+    // When we are the closest node and someone is sending us a "store" command
+    update (query, cb) {
+      if (!query.value) return cb()
+
+      // Use the hash of the value as the key
+      const key = sha256(query.value).toString('hex')
+      values.set(key, query.value)
+      console.log('Storing', key, '-->', query.value.toString())
+      cb()
+    },
+    // When someone is querying for a "lookup" command
+    query (query, cb) {
+      const value = values.get(query.target.toString('hex'))
+      cb(null, value)
+    }
+  })
+}
+
+function sha256 (val) {
+  return crypto.createHash('sha256').update(val).digest()
+}