add terraform-provider-coder (#250)

README.md

@@ -251,6 +251,7 @@ For more Community Modules not listed here please see the [Terraform Module Regi
 - [terraform-provider-azuredevops](https://github.com/microsoft/terraform-provider-azuredevops) - Provider for Azure DevOps (VSTS).
 - [terraform-provider-buildkite](https://github.com/buildkite/terraform-provider-buildkite) - Provider for Buildkite.
 - [terraform-provider-checkly](https://github.com/checkly/terraform-provider-checkly) - Manage [Checkly](https://www.checklyhq.com) resources for API & E2E monitoring.
+- [terraform-provider-coder](https://github.com/coder/terraform-provider-coder) - Provider for [Coder](https://coder.com)
 - [terraform-provider-confluent](https://github.com/confluentinc/terraform-provider-confluent) - Provider for Confluent.
 - [terraform-provider-datadog](https://github.com/DataDog/terraform-provider-datadog) - Provider for Datadog.
 - [terraform-provider-digitalocean](https://github.com/digitalocean/terraform-provider-digitalocean) - Provider for DigitalOcean.