usage service initial commit

tools/usage-service/Dockerfile

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+# Will try alpine initially. Pandas may require core.
+FROM python:3.11-alpine
+# WORKDIR /app - Don't think this is needed, as everything comes from pypi
+RUN pip3 install --no-cache-dir pwdusage
+# COPY . . - or this, as we don't copy any files in.
+CMD ["python3", "-m", "pwdusage.server"]
+EXPOSE 9050 

tools/usage-service/README.md

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+# Powerwall-Dashboard Usage Micro Service
+
+This folder contains the sample setup files for a usage microservice that integrates
+into Powerwall-Dashboard. This service provides a proxy that generates usage and 
+cost/savings information based on utility usage plans. As of 4/6/2023, this service only
+supports a general time of use plan, but the service is extensible to different plans.
+
+For documentation on the micro-service, refer to: 
+https://github.com/BuongiornoTexas/pwdusage.
+
+The files in this folder are:
+
+- `example_usage.json`, a sample configuration file for the microservice, which is a 
+duplicate of the sample file in the `pwdusage` repository.
+- `example-dashboard.json`, a sample grafana dashboard that demonstrates the output of 
+the usage service with the sample configuration file.
+- `Dockerfile` is the docker configuration file used to generate the containerised
+microservice from the `pwdusage` python package.
+
+The documentation for `pwdusage` details usage of these files.
+