Add README

README.md

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+# texbox
+
+## Build
+
+Build the container. This may take some seconds, as `tex-full` is rather huge.
+
+`sudo docker build . -t "texbox"`
+
+## Run
+
+`cd` into the current directory and replace `<filename.tex>` with your TeX filename.
+Then run the following command:
+
+`sudo docker run -v "$(pwd)":/tex -e TARGET=<filename.tex> texbox`