added Makefiles

Makefile

@@ -0,0 +1,11 @@
+SUBDIRS := canJump jump majorityelement maxprofit maxprofit2 rmdupfromsortedarray rmdupfromsortedarray2 rotate twopointers
+
+all: $(SUBDIRS)
+
+$(SUBDIRS):
+	$(MAKE) -C $@
+
+.PHONY: all $(SUBDIRS)
+
+clean:
+	for d in $(SUBDIRS); do (cd $$d && $(MAKE) clean); done