Add example program for nrf52840

.vscode/settings.json

@@ -1,6 +1,7 @@
 {
     "rust-analyzer.linkedProjects": [
         "Cargo.toml",
-        "fuzz/Cargo.toml"
+        "fuzz/Cargo.toml",
+        "example/Cargo.toml"
     ]
 }

example/.cargo/config.toml

@@ -0,0 +1,13 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace nRF82840_xxAA with your chip as listed in `probe-rs chip list`
+runner = "probe-rs run --chip nRF52840_xxAA"
+
+[build]
+target = "thumbv7em-none-eabihf"
+
+[env]
+DEFMT_LOG = "trace"
+
+[unstable]
+build-std = ["panic_abort", "core"]
+build-std-features = ["panic_immediate_abort"]

example/.gitignore

@@ -0,0 +1 @@
+/target