Initial beacon node setup.

- Add network crate.
- Add sync crate.
- Add version crate.
- Add lighthouse configuration.
- Add network configuration.

beacon_node/network/src/lib.rs

@@ -0,0 +1,4 @@
+/// This crate provides the network server for Lighthouse.
+mod network_configuration;
+
+pub use network_configuration::NetworkConfiguration;

beacon_node/network/src/network_configuration.rs

@@ -0,0 +1,39 @@
+use libp2p::gossipsub::{GossipsubConfig, GossipsubConfigBuilder};
+use std::net::IpAddr;
+use version;
+
+#[derive(Debug, Clone)]
+/// Network configuration for lighthouse.
+pub struct NetworkConfiguration {
+    //TODO: stubbing networking initial params, change in the future
+    /// IP address to listen on.
+    pub listen_address: Option<IpAddr>,
+    /// Listen port UDP/TCP.
+    pub listen_port: Option<u16>,
+    /// Gossipsub configuration parameters.
+    pub gs_config: GossipsubConfig,
+    /// List of nodes to initially connect to.
+    pub boot_nodes: Vec<String>,
+    /// Client version
+    pub client_version: String,
+    //TODO: more to be added
+}
+
+impl Default for NetworkConfiguration {
+    /// Generate a default network configuration.
+    fn default() -> Self {
+        NetworkConfiguration {
+            listen_address: None,
+            listen_port: None,
+            gs_config: GossipsubConfigBuilder::new().build(),
+            boot_nodes: Vec::new(),
+            client_version: version::version(),
+        }
+    }
+}
+
+impl NetworkConfiguration {
+    pub fn new() -> Self {
+        NetworkConfiguration::default()
+    }
+}