Merge pull request #11 from getsentry/spalmurray/temp-readme

chore: Add placeholder README

Author: spalmurray

README.md

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+# Sentry Prevent CLI
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+[![codecov](https://codecov.io/gh/getsentry/prevent-cli/branch/main/graph/badge.svg)](https://codecov.io/gh/getsentry/prevent-cli)
+
+The Sentry Prevent CLI is responsible for uploading code coverage and test results to Sentry. It can be used directly or indirectly through our [Sentry Prevent GitHub Action](https://github.com/getsentry/prevent-action).
+
+This Repo and README are still a work in progress.