chore: initial readme (#4)

LICENCE

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+MIT License
+
+Copyright (c) 2020
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Sentry 10 helm charts
+
+Sentry is a cross-platform crash reporting and aggregation platform.
+
+This repository aims to support Sentry 10 and move out from the deprecated Helm charts official repo.
+
+Big thanks from the maintainers of the [deprecated chart](https://github.com/helm/charts/tree/master/stable/sentry). This work has been partly inspired by it.
+
+## How this chart works
+
+This repository contains 2 charts : 
+- sentry, containing all the sentry services
+- sentry-db, containing all the (optional) databases
+
+`helm repo add sentry https://sentry-kubernetes.github.io/charts/charts`
+
+## Values
+
+For now the full list of values is not documented by you can get inspired by the values.yaml specific to each directory.
+
+## Roadmap
+
+- [X] Lint in Pull requests
+- [X] Public availability through Github Pages
+- [X] Automatic deployment through Github Actions
+- [ ] Postgres part of sentry-db
+- [ ] Symbolicator deployment
+- [ ] Testing the chart in a production environment
+- [ ] Improving the README