Adding post on values schema reference

Signed-off-by: Matt Farina <matt.farina@suse.com>

content/blog/2021-02-10-helm-values-schema-reference/index.md

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+---
+title: "Helm Values Schema Reference"
+date: 2021-02-10T00:00:00-05:00
+author: "Matt Farina"
+authorLink: "https://mattfarina.com"
+slug: "helm-values-schema-reference"
+---
+
+Helm v3 introduced [schemas for values](https://helm.sh/docs/topics/charts/#schema-files). The schemas are written as JSON Schemas and put in a chart in a file named `values.schema.json` that goes right alongside `values.yaml` files. Wouldn't it be great if there was a way to easily use these files to understand the values in a chart? Artifact Hub provides just that with its Values Schema Reference.<!--more-->
+
+![Artifact Hub chart values schema reference](values-schema-reference.png)
+
+This image is the [Values Schema Reference for the chart that installs the Artifact Hub](https://artifacthub.io/packages/helm/artifact-hub/artifact-hub?modal=values-schema) software.
+
+On the left is YAML for the values, on the right is the information from the schema lined up with the YAML on the left, and at the top is a search box with autocomplete.
+
+Using this information you can learn more about any chart that provides a schema. Accessing the Values Schema Reference happens through a button in the right sidebar, when a schema is available for a chart.