New README

README.md

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+# Docker images for opensnp.org
+
+Currently two images - a *opensnp.org-docker* image and a *dev* image. The *opensnp.org-docker* image in the root folder pulls all gems and other dependencies. The *dev* image adds a few dummy files so that you can run the image in a local container.
+
+# How to build the images
+
+In a screen session:
+
+    docker daemon
+
+to run the docker server. Then in the root folder:
+
+    docker build -t opensnp.org-docker .
+
+This builds the *opensnp.org-docker* image and sets the name to *opensnp.org-docker*. This step takes ~10 minutes since it installs all dependencies and gems.
+
+Then to build the *dev* image:
+
+    cd dev_image
+    docker build -t dev .
+
+To see all images:
+
+    docker images
+
+should show two images, one named *opensnp.org-docker* and one named *dev*.
+
+Now you can either build a container based on the *dev* image or on the *opensnp.org-docker* image.
+
+# Building the dev container
+
+    docker create dev
+    docker run dev
+