[CI] Add default example

Build BareMinimum for all selected target

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

CI/build/examples/BareMinimum/BareMinimum.ino

@@ -0,0 +1,9 @@
+void setup() {
+  // put your setup code here, to run once:
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}

CI/build/examples/BareMinimum/BareMinimum.txt

@@ -0,0 +1 @@
+The bare minimum of code needed to start an Arduino sketch.