Add new challenge

challenges/write_dockerfile_run_container.md

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+# Write a Dockerfile and run a container
+
+Your task is as follows:
+
+1. Create a Docker image:
+  * Use centos or ubuntu as the base image
+  * Install apache web server
+  * Deploy any web application you want
+  * Add https support (using HAProxy as reverse-proxy)))
+2. Once you wrote the Dockerfile and created an image, run the container and test the application. Describe how did you test it and provide output
+3. Describe one or more weakness of your Dockerfile. Is it ready to be used in production?