doc: add readme

README.md

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+# MakairaIO helm-charts
+
+In this repository ou can find custom helm-charts that are used at Makaira.
+
+## Charts inside this repository
+### matomo
+We are using Matomo for our analytics. For that, we adjusted the matomo chart from t3n to our own needs and published it here.
+
+### php-stack
+We created a chart that is used for all of our custom PHP microservices. We needed a flexibile solution that offer support for workers, cronjobs, migrations and some other things. These and more features are provided by this chart. 
+
+*It is based on the common chart from k8s-at-home, the MariaDB and the the Redis chart by Bitnami.*
+
+More information about this chart can be found inside the [readme](/charts/php-stack) of the chart.
+
+## How to use this repository
+
+### Add the repository to your Helm repositories
+```bash
+helm repo add makaira https://charts.makaira.io
+```
+
+### Reference the chart inside your Chart.yaml as a dependency
+```yaml
+dependencies:
+  - name: php-stack
+    version: 2.2.0
+    repository: https://charts.makaira.io
+    alias: example-deployment
+```