feat: change dummy c to a rust plugin example

examples/custom_plugin/src/lib.rs

@@ -0,0 +1,30 @@
+use librustdesk::{api::RustDeskApiTable};
+/// This file demonstrates how to write a custom plugin for RustDesk.
+use std::ffi::{c_char, c_int, CString};
+
+lazy_static::lazy_static! {
+    pub static ref PLUGIN_NAME: CString = CString::new("A Template Rust Plugin").unwrap();
+    pub static ref PLUGIN_ID: CString = CString::new("TemplatePlugin").unwrap();
+    // Do your own logic based on the API provided by RustDesk.
+    pub static ref API: RustDeskApiTable = RustDeskApiTable::default();
+}
+
+#[no_mangle]
+fn plugin_name() -> *const c_char {
+    return PLUGIN_NAME.as_ptr();
+}
+
+#[no_mangle]
+fn plugin_id() -> *const c_char {
+    return PLUGIN_ID.as_ptr();
+}
+
+#[no_mangle]
+fn plugin_init() -> c_int {
+    return 0 as _;
+}
+
+#[no_mangle]
+fn plugin_dispose() -> c_int {
+    return 0 as _;
+}