Rust docs (#681)

crates/cdk-payment-processor/src/lib.rs

@@ -1,3 +1,7 @@
+#![doc = include_str!("../README.md")]
+#![warn(missing_docs)]
+#![warn(rustdoc::bare_urls)]
+
 pub mod error;
 pub mod proto;
 

crates/cdk-payment-processor/src/proto/mod.rs

@@ -1,3 +1,5 @@
+//! Proto types for payment processor
+
 use std::str::FromStr;
 
 use cdk_common::payment::{

crates/cdk-payment-processor/src/proto/server.rs

@@ -32,6 +32,7 @@ pub struct PaymentProcessorServer {
 }
 
 impl PaymentProcessorServer {
+    /// Create new [`PaymentProcessorServer`]
     pub fn new(
         payment_processor: Arc<dyn MintPayment<Err = cdk_common::payment::Error> + Send + Sync>,
         addr: &str,