CDPCP-9777 - Add reference / link to CDP Quickstart module

[balazsgaspar]

Add reference to the various terraform modules available from https://github.com/cloudera-labs/terraform-cdp-modules and https://github.com/cloudera-labs/cdp-tf-quickstarts

[github-actions]

Go test coverage: 7.3% for commit ead44ae

⚠️ 3 of 7 packages have zero coverage.

• github.com/cloudera/terraform-provider-cdp/resources/datalake
• github.com/cloudera/terraform-provider-cdp/resources/iam
• github.com/cloudera/terraform-provider-cdp/resources/ml

View coverage for all packages

# Package Name                                                      | Coverage
+ github.com/cloudera/terraform-provider-cdp/provider               |    56.0%
+ github.com/cloudera/terraform-provider-cdp/resources/datahub      |    13.3%
- github.com/cloudera/terraform-provider-cdp/resources/datalake     |     0.0%
+ github.com/cloudera/terraform-provider-cdp/resources/environments |     2.2%
- github.com/cloudera/terraform-provider-cdp/resources/iam          |     0.0%
- github.com/cloudera/terraform-provider-cdp/resources/ml           |     0.0%
+ github.com/cloudera/terraform-provider-cdp/utils                  |    30.4%