README.md: update README.md.

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diff --git a/app/build.sh b/app/build.sh
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+#!/bin/sh
+
+cd /home/lanhui/englishpal
+
+# Stop service
+sudo service docker restart
+
+# Rebuild container. Run this after modifying the source code.
+sudo docker build -t englishpal .
+
+# Run the application
+sudo docker run -d -p 90:80 -v /home/lanhui/englishpal/app/static/frequency:/app/static/frequency -t englishpal  # for permanently saving data
+
+# Save space.  Run it after sudo docker run
+sudo docker system prune -a -f
+
+