Move whole rmcp crate to offcial rust sdk (#44)

* get rid of async-trait

* move rmcp to official-rust-sdk

* replace master with main

* update readme, change license

* fix typo

* Update README.md

Co-authored-by: Jefry Dewangga <jefrydco@gmail.com>

* fix typos

---------

Co-authored-by: = <=>
Co-authored-by: Jefry Dewangga <jefrydco@gmail.com>

examples/servers/src/common/calculator.rs

@@ -0,0 +1,45 @@
+use rmcp::{
+    ServerHandler,
+    model::{ServerCapabilities, ServerInfo},
+    schemars, tool,
+};
+
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct SumRequest {
+    #[schemars(description = "the left hand side number")]
+    pub a: i32,
+    pub b: i32,
+}
+#[derive(Debug, Clone)]
+pub struct Calculator;
+#[tool(tool_box)]
+impl Calculator {
+    #[tool(description = "Calculate the sum of two numbers")]
+    fn sum(&self, #[tool(aggr)] SumRequest { a, b }: SumRequest) -> String {
+        (a + b).to_string()
+    }
+
+    #[tool(description = "Calculate the sum of two numbers")]
+    fn sub(
+        &self,
+        #[tool(param)]
+        #[schemars(description = "the left hand side number")]
+        a: i32,
+        #[tool(param)]
+        #[schemars(description = "the left hand side number")]
+        b: i32,
+    ) -> String {
+        (a - b).to_string()
+    }
+}
+
+#[tool(tool_box)]
+impl ServerHandler for Calculator {
+    fn get_info(&self) -> ServerInfo {
+        ServerInfo {
+            instructions: Some("A simple calculator".into()),
+            capabilities: ServerCapabilities::builder().enable_tools().build(),
+            ..Default::default()
+        }
+    }
+}