add readme.md to fido2-rs

Author: tyan-boot

README.MD

@@ -7,21 +7,21 @@
 1. Make a credential
 ```rust
 use fido2_rs::device::Device;
-use fido2_rs::credentials::CredentialRequest;
+use fido2_rs::credentials::Credential;
 use fido2_rs::credentials::CoseType;
 use anyhow::Result;
-
 fn main() -> Result<()> {
     let dev = Device::open("windows://hello").expect("unable open windows hello");
 
-    let request = CredentialRequest::builder()
-        .client_data(&[1, 2, 3, 4, 5, 6])?
-        .rp("fido_rs", "fido example")?
-        .user(&[1, 2, 3, 4, 5, 6], "alice", Some("alice"), None)?
-        .cose_type(CoseType::RS256)?
-        .build();
-    let cred = dev.make_credential(request, None)?;
+    let mut cred = Credential::new();
+    cred.set_client_data(&[1, 2, 3, 4, 5, 6])?;
+    cred.set_rp("fido_rs", "fido example")?;
+    cred.set_user(&[1, 2, 3, 4, 5, 6], "alice", Some("alice"), None)?;
+    cred.set_cose_type(CoseType::RS256)?;
+
+    let _ = dev.make_credential(&mut cred, None)?;
     dbg!(cred.id());
+
     Ok(())
 }
 ```
@@ -33,4 +33,4 @@ fn main() -> Result<()> {
 # TODO
 
 * [ ] more doc
-* [ ] full bindings to `fido_cred_t` and `fido_assert_t`
+* [x] full bindings to `fido_cred_t` and `fido_assert_t`

fido2-rs/README.MD

@@ -0,0 +1,5 @@
+# fido2-rs
+
+[libfido2](https://github.com/Yubico/libfido2) bindings for the Rust programming language.
+
+For more details, see [tyan-boot/fido-rs](https://github.com/tyan-boot/fido-rs)