Add NFC example application

examples/nfct_test.rs

@@ -0,0 +1,20 @@
+extern crate lang_items;
+
+use libtock_drivers::console::Console;
+use libtock_drivers::nfc;
+
+fn main(){
+    writeln!(console, "****************************************").unwrap();
+    writeln!(console, "nfct_test application is installed").unwrap();
+    writeln!(console, "****************************************").unwrap();
+
+    // 1. Subscribe to a SELECTED CALLBACK
+    // 2. Configure Type 4 tag
+    // [_.] Enable Tag emulation (currently the tag is always activated)
+    // loop {
+        // 1. Allow Receive Buffer
+        // 2. Subscribe to RECEIVE CALLBACK
+        // 3. Allow TX buffer
+        // 4. Subscribe to TX CALLBACK
+    // }
+}