add dockerfiles

.docker/mathoid/Dockerfile

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+FROM node:8-stretch-slim
+
+RUN apt-get update && \
+    apt-get install -y librsvg2-dev git make g++
+
+RUN git clone https://github.com/wikimedia/mathoid
+WORKDIR /mathoid
+RUN npm install
+
+EXPOSE 10044
+
+CMD ["/mathoid/server.js"]

.docker/texoid/Dockerfile

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+FROM python:slim
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        texlive-binaries texlive-generic-extra texlive-generic-recommended \
+        texlive-latex-base texlive-latex-extra texlive-latex-recommended \
+        texlive-pictures texlive-pstricks librsvg2-bin xxd imagemagick git \
+        build-essential python-dev
+
+RUN git clone https://github.com/DMOJ/texoid/
+WORKDIR /texoid/
+RUN pip3 install -e .
+
+EXPOSE 8888
+ENTRYPOINT texoid --address=texoid --port=8888