Add Dockerfile to show-case tmux and serve as installation guide

Dockerfile

@@ -0,0 +1,46 @@
+FROM debian:stretch-slim
+
+RUN apt-get update  \
+  && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    fontconfig \
+    git \
+    gcc \
+    iputils-ping \
+    libevent-dev \
+    libncurses-dev \
+    locales \
+    make \
+    procps \
+    wget \
+  && wget -O - https://github.com/tmux/tmux/releases/download/2.6/tmux-2.6.tar.gz | tar xzf - \
+  && cd tmux-2.6 \
+  && LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" ./configure --prefix=/usr/local \
+  && make \
+  && make install \
+  && cd .. \
+  && rm -rf tmux-2.6 \
+  && apt-get purge -y gcc make \
+  && apt-get -y autoremove \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen \
+  && locale-gen
+ENV LC_ALL=en_US.UTF-8
+ENV LANG=en_US.UTF-8
+
+RUN mkdir -p $HOME/.fonts $HOME/.config/fontconfig/conf.d \
+  && wget -P $HOME/.fonts https://github.com/powerline/powerline/raw/develop/font/PowerlineSymbols.otf \
+  && wget -P $HOME/.config/fontconfig/conf.d/ https://github.com/powerline/powerline/raw/develop/font/10-powerline-symbols.conf \
+  && fc-cache -vf $HOME/.fonts/
+
+WORKDIR /root
+
+RUN git clone https://github.com/samoshkin/tmux-config \
+  && ./tmux-config/install.sh \
+  && rm -rf ./tmux-config
+
+ENV TERM=xterm-256color
+
+