Add context7 lib documentation

This allows for an improved usability of context7 for this
project.
See this: https://context7.com/gridscale/packer-plugin-gridscale?topic=storage

Author: fabiante

context7.md

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://context7.com/schema/context7.json",
+  "projectTitle": "Packer Plugin Gridscale",
+  "description": "A Packer plugin that integrates with HashiCorp Packer to enable the creation of custom virtual machine templates on the gridscale cloud platform.",
+  "branch": "main",
+  "excludeFolders": [
+    ".github",
+    ".web-docs",
+    "docs-partials",
+    "vendor",
+    "version",
+  ],
+  "excludeFiles": [
+    "CHANGELOG.md",
+    "CHANGELOG.mdx"
+  ]
+}