Docs: General documentation for a Pool

docs/Pool.md

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+# Pool
+
+A pool maintains a connection of [Peers](Peer.md). A pool will discover peers via DNS seeds, as well as when peer addresses are announced through the network.
+
+The quickest way to get connected is to run the following:
+
+```javascript
+
+var bitcore = require('bitcore');
+var Pool = bitcore.transport.Pool;
+var Networks = bitcore.Networks;
+
+var pool = new Pool(Networks.livenet);
+
+// connect to the network
+pool.connect();
+
+// attach peer events
+pool.on('peerinv', function(peer, message) {
+  // a new peer message has arrived
+});
+
+// will disconnect all peers
+pool.disconnect()
+
+```
+
+For more information about Peer events, please read the [Peer](Peer.md) documentation. Peer events are relayed to the pool, a peer event `inv` in the pool would be `peerinv`. When a peer is disconnected the pool will try to connect to the list of known addresses to maintain connection.