add readme and dockerfile before big refactoring

Dockerfile

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+FROM python:3.10-alpine
+
+WORKDIR /app
+
+COPY src/requirements.txt requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY src/ /app
+
+CMD ["python", "main.py"]

README.md

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+# Pair Monitor
+Companion piece to [matrix-alerts](https://git.juggalol.com/agatha/matrix-alerts). It will all come together
+in a single repo at some point, but I have a lot of refactoring to do on everything. I split up the
+[mbot](https://git.juggalol.com/agatha/mbot) code into smaller services but haven't refactored _anything_ yet.
+
+## Configuration Example
+```
+{
+  "infura_url": "",
+  "pool_address": "0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f",
+  "etherscan_key": ""
+}
+```