Added initial Makefile (wip) and esp-open-sdk as a submodule

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "micropython"]
 	path = micropython
 	url = https://github.com/micropython/micropython.git
+[submodule "esp-open-sdk"]
+	path = esp-open-sdk
+	url = https://github.com/pfalcon/esp-open-sdk

Makefile

@@ -0,0 +1,26 @@
+
+
+build: micropython
+
+
+micropython: check-and-reinit-micropython-submodules
+	$(MAKE) --directory=micropython/mpy-cross
+	$(MAKE) --directory=micropython/ports/esp8266
+
+
+check-and-reinit-submodules:
+	@echo "Checking submodules"
+	@if git submodule status | egrep -q '^[-]|^[+]' ; then \
+	    echo "INFO: Need to reinitialize git submodules"; \
+	    git submodule update --init; \
+	fi
+
+
+check-and-reinit-micropython-submodules: check-and-reinit-submodules
+	@echo "Checking micropython submodules"
+	@if cd micropython; git submodule status | egrep -q '^[-]|^[+]' ; then \
+	    echo "INFO: Need to reinitialize micropython git submodules"; \
+	    git submodule update --init; \
+	fi
+
+.PHONY: check-and-reinit-submodules check-and-reinit-micropython-submodules

esp-open-sdk

@@ -0,0 +1 @@
+Subproject commit c70543e57fb18e5be0315aa217bca27d0e26d23d