Add message publishing skeleton

Change-Id: I18e55f4221575ba782f518d33e1b1f3abcc5d683

solana/anchor-bridge/programs/anchor-bridge/src/api.rs

@@ -1,6 +1,8 @@
 pub mod initialize;
+pub mod publish_message;
 pub mod verify_signatures;
 
 // Re-expose underlying module functions and data, for consuming APIs to use.
 pub use initialize::*;
+pub use publish_message::*;
 pub use verify_signatures::*;

solana/anchor-bridge/programs/anchor-bridge/src/api/publish_message.rs

@@ -0,0 +1,16 @@
+use anchor_lang::{prelude::*, solana_program};
+
+use crate::{
+    accounts,
+    anchor_bridge::Bridge,
+    types::{BridgeConfig, Version},
+    PublishMessage,
+};
+
+pub fn publish_message(
+    bridge: &mut Bridge,
+    ctx: Context<PublishMessage>,
+) -> ProgramResult {
+    Ok(())
+}
+

solana/anchor-bridge/programs/anchor-bridge/src/lib.rs

@@ -69,6 +69,12 @@ pub struct InitializeData {
     pub config: BridgeConfig,
 }
 
+#[derive(Accounts)]
+pub struct PublishMessage {}
+
+#[derive(AnchorSerialize, AnchorDeserialize, Clone, Copy, Debug)]
+pub struct PublishMessageData {}
+
 #[program]
 pub mod anchor_bridge {
     use super::*;
@@ -89,6 +95,13 @@ pub mod anchor_bridge {
             )
         }
 
+        pub fn publish_message(&mut self, ctx: Context<PublishMessage>, data: PublishMessageData) -> ProgramResult {
+            api::publish_message(
+                self,
+                ctx,
+            )
+        }
+
         pub fn verify_signatures(&mut self, ctx: Context<VerifySig>, data: VerifySigsData) -> ProgramResult {
             api::verify_signatures(
                 self,