added redis cache docker container for development

Author: jmw5598

cache/Dockerfile

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+FROM redis:latest
+ENTRYPOINT ["redis-server"]

cache/README.md

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+# Redis Cache
+
+This is a dockerfile to setup Redish for caching for development purposes.  You can opt out of using the Redis cache by changing `CACHE_USE_REDIS` flag on `server/environments/dev.env` file.
+
+### Requirements
+1. docker
+
+### Setup
+1. Build the docker image with `./build.sh`.
+2. Start the docker image with `./start.sh`.

cache/build.sh

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+#!/bin/sh
+
+docker build . -t latest/vsp_cache

cache/start.sh

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+#!/bin/sh
+
+docker run \
+  --name vsp_cache \
+  -p 6379:6379 \
+  -d \
+  latest/vsp_cache