Add pip/README.md

pip/README.md

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+
+```Dockerfile
+FROM alpine:latest
+
+RUN apk add --no-cache tini py-pip curl gcc
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+ENV PATH="/root/.cargo/bin:${PATH}"
+RUN PIP_BREAK_SYSTEM_PACKAGES=1 pip install mitmproxy
+```