Add Initial BETA Test release of the Common Chart and testing environment

Co-authored-by: Troy Prelog <tprelog@users.noreply.github.com>
Signed-off-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>

library/common/README.md

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+# Library chart for k8s@home media charts
+
+**WARNING: THIS CHART IS NOT MEANT TO BE INSTALLED DIRECTLY**
+
+This is a [Helm Library Chart](https://helm.sh/docs/topics/library_charts/#helm). It's purpose is for grouping common logic between the k8s@home charts. 
+
+Since a lot of charts follow the same pattern this library was built to reduce maintenance cost between the charts that use it and try achieve a goal of being DRY.
+
+## Introduction
+
+This chart provides common template helpers which can be used to develop new charts using [Helm](https://helm.sh) package manager.
+
+## :star2: Changelog
+
+Please refer to [CHANGELOG.md](CHANGELOG.md) for an overview of notable changes to the chart. **This is especially important for major version updates!**
+
+## TL;DR
+
+When using one of the many charts that uses this library be sure to view this [values.yaml](./values.yaml) for configuration options. Any setting here can be used to define what values your helm deployment will use.
+
+For example using the helm CLI tool
+
+```bash
+helm install node-red \
+  --set image.repository="nodered/node-red" \
+  --set image.tag="1.2.5" \
+  --set env.TZ="America/New_York" \
+  k8s-at-home/node-red
+```
+
+or
+
+```yaml
+# node-red-values.yaml
+image:
+  repository: nodered/node-red
+  tag: 1.2.5
+env:
+  TZ: America/New_York
+```
+
+```bash
+helm install node-red \
+  --values=./node-red-values.yaml \
+  k8s-at-home/node-red
+```
+
+## Creating a new chart
+
+First be sure to checkout the many charts that already use this like [qBittorrent](../qbittorrent/), [node-red](../node-red/) or the many others in this repository.
+
+Include this chart as a dependency in your `Chart.yaml` e.g.
+
+```yaml
+# Chart.yaml
+dependencies:
+  - name: common
+    version: x.x.x
+    repository: https://k8s-at-home.com/charts/
+```
+
+Write a `values.yaml` with some basic defaults you want to present to the user e.g.
+
+```yaml
+# Default values for node-red.
+
+image:
+  repository: nodered/node-red
+  pullPolicy: IfNotPresent
+  tag: 1.2.5
+
+strategy:
+  type: Recreate
+
+# See more environment varaibles in the node-red documentation
+# https://nodered.org/docs/getting-started/docker
+env: {}
+  # TZ:
+  # NODE_OPTIONS:
+  # NODE_RED_ENABLE_PROJECTS:
+  # NODE_RED_ENABLE_SAFE_MODE:
+  # FLOWS:
+
+service:
+  port:
+    port: 1880
+
+persistence:
+  data:
+    enabled: false
+    emptyDir: false
+    mountPath: /data
+```
+
+If testing locally make sure you update the dependencies with:
+
+```bash
+helm dependency update
+```