docs: Add badges to README.

Author: skyzyx

README.md

@@ -1,5 +1,12 @@
 # Terraform Provider: Core Functions
 
+![GitHub](https://img.shields.io/github/license/northwood-labs/terraform-provider-corefunc?style=for-the-badge)
+![Go Report Card](https://goreportcard.com/badge/github.com/northwood-labs/terraform-provider-corefunc?style=for-the-badge)
+![GitHub issues](https://img.shields.io/github/issues/northwood-labs/terraform-provider-corefunc?style=for-the-badge)
+![GitHub contributors](https://img.shields.io/github/contributors/northwood-labs/terraform-provider-corefunc?style=for-the-badge)
+![GitHub commit activity (branch)](https://img.shields.io/github/commit-activity/m/northwood-labs/terraform-provider-corefunc?style=for-the-badge)
+![GitHub all releases](https://img.shields.io/github/downloads/northwood-labs/terraform-provider-corefunc/total?style=for-the-badge)
+
 > [!NOTE]
 > We intend to support OpenTofu (née OpenTF) in addition to Terraform.