restructure into multiple crates

add mcp server collection

mcp_server_collection/src/datetime.rs

@@ -0,0 +1,47 @@
+use chrono::{Datelike, Local};
+use rmcp::model::{Implementation, ServerCapabilities, ServerInfo};
+use rmcp::{tool, tool_handler, tool_router, ServerHandler};
+use rmcp::handler::server::tool::ToolRouter;
+use crate::McpServerHandler;
+
+#[derive(Debug, Clone)]
+pub struct DateTimeHandler {
+    tool_router: ToolRouter<Self>
+}
+
+impl McpServerHandler for DateTimeHandler {
+    fn new() -> Self {
+        DateTimeHandler { tool_router: Self::tool_router() }
+    }
+}
+
+#[tool_router]
+impl DateTimeHandler {
+    #[tool(description = "returns the local datetime in ISO 8601", annotations(read_only_hint = true))]
+    fn get_local_datetime() -> String {
+        Local::now().format("%+").to_string()
+    }
+
+    #[tool(description = "returns the utc datetime in ISO 8601", annotations(read_only_hint = true))]
+    fn get_utc_datetime() -> String {
+        Local::now().format("%+").to_string()
+    }
+
+    #[tool(description = "return current week number in year", annotations(read_only_hint = true))]
+    fn get_week() -> String {
+        Local::now().iso_week().week().to_string()
+    }
+
+    #[tool(description = "return current weekday as 3-character-string (e.g. Mon, Tue, ...)", annotations(read_only_hint = true))]
+    fn get_weekday() -> String {
+        Local::now().weekday().to_string()
+    }
+}
+
+#[tool_handler]
+impl ServerHandler for DateTimeHandler {
+    fn get_info(&self) -> ServerInfo {
+        ServerInfo::new(ServerCapabilities::builder().enable_tools().build())
+            .with_instructions("A simple clock/datetime provider. It is read only and thus safe to use.".to_string()).with_server_info(Implementation::new("datetime", env!("CARGO_PKG_VERSION")))
+    }
+}