Added blinka test file.

blinka-test.py

@@ -0,0 +1,19 @@
+import board
+import digitalio
+import busio
+
+print("Hello, blinka!")
+
+# Try to create a Digital input
+pin = digitalio.DigitalInOut(board.D4)
+print("Digital IO ok!")
+
+# Try to create an I2C device
+i2c = busio.I2C(board.SCL, board.SDA)
+print("I2C ok!")
+
+# Try to create an SPI device
+spi = busio.SPI(board.SCLK, board.MOSI, board.MISO)
+print("SPI ok!")
+
+print("done!")