initial Dockerfile commit

Dockerfile

@@ -0,0 +1,12 @@
+#use 32-bit ubuntu 12.04 required by valgrind. 64-bit has some known issues
+from shawn/ubuntu-precise-i386
+MAINTAINER David Liu <email4dliu@gmail.com>
+
+LABEL Description="Do your C/C++ development in Docker container. Based on Ubuntu, and added build-essential and valgrind so you can use g++/gcc/gdb/valgrind."
+
+
+#adds gcc valgrind
+run apt-get install -y build-essential valgrind 
+
+WORKDIR /app
+CMD /bin/bash