Patch for MetroX Arduino Repo (espressif#88)

* add new build platform

* split it out

Co-authored-by: brentru <[email protected]>

Author: brentru

Diff for: build_platform.py

@@ -24,6 +24,9 @@
 if "Adafruit_Learning_System_Guides" in BUILD_DIR:
     print("Found learning system repo")
     IS_LEARNING_SYS = True
+elif "METROX-Examples-and-Project-Sketches" in BUILD_DIR:
+    print("Found MetroX Examples Repo")
+    IS_LEARNING_SYS = True
 
 #os.system('pwd')
 #os.system('ls -lA')