Add ESP8266 example

examples/esp8266/Makefile

@@ -0,0 +1,10 @@
+THISDIR = $(realpath $(CURDIR))
+ROOTDIR = $(realpath $(CURDIR)/../..)
+
+all: example
+
+example: src/main/main.c src/main/wifi.c Makefile
+	docker run --rm -v $(ROOTDIR):$(ROOTDIR) -w $(THISDIR) docker.io/mdashnet/8266 make -C src defconfig app
+
+clean:
+	rm -rf $(PROG) *.o *.dSYM *.gcov *.gcno *.gcda *.obj *.exe *.ilk *.pdb mongoose mongoose_* mongoose.* src/build src/sdkconfig