Added dockerfile

[ms-jpq]

With Docker, you can now use textidote without installing jdk:8 on your system.

This is useful for people who do not want to deal with potentially multiple versions of java or do not want to install java on their system for the sole purpose of running textidote.

To test, you will need docker:

sudo apt install docker.io

Then you can build textidote with

docker build --tag textidote .

After the image finishes building, you can run it using:

cat somefile.tex | docker run -i --rm textidote