Added solana sdk and executor

Cargo.toml

@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+anyhow = "1.0.104"
+solana-sdk = "4.1.0"

src/executor/mod.rs

@@ -0,0 +1,7 @@
+use solana_sdk::pubkey::Pubkey;
+
+#[allow(async_fn_in_trait)]
+pub trait Executor {
+    async fn buy(&self, token: Pubkey, amount: f64) -> anyhow::Result<()>;
+    async fn sell(&self, token: Pubkey, amount: f64) -> anyhow::Result<()>;
+}

src/main.rs

@@ -1,3 +1,5 @@
+pub mod executor;
+
 fn main() {
     println!("Hello, world!");
 }