docs(TeamCity): Adding TeamCity module docs and example architecture

Author: awsbilal

docs/media/diagrams/teamcity-server-architecture.drawio

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+---
+title: TeamCity Example
+description: TeamCity Deployment Example
+---
+
+# TeamCity Deployment Example
+
+This example provisions [TeamCity](https://www.jetbrains.com/teamcity/) and several AWS resources, such as VPC and DNS resources, more details below.
+
+## Variables
+
+This example takes in one input variables:`root_domain_name`.
+
+### `root_domain_name`
+
+The `root_domain_name` is expected to correspond to an existing [AWS Route53 hosted zone](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/route-53-concepts.html#route-53-concepts-hosted-zone). This hosted zone is used for provisioning DNS records used for external and internal routing, and enables this example to create validated SSL certificates on your behalf.
+
+If you do not have a domain yet you can [register one through Route53](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/domain-register.html#domain-register-procedure-section).
+
+If you already have a domain with a different domain registrar you can leverage Route53 for DNS services. [Please review the documentation for migrating to Route53 as your DNS provider.](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/MigratingDNS.html)
+
+If you own the domain: "example.com" this example will deploy TeamCity to "teamcity.example.com" - this can be modified from the `dns.tf` file.
+
+
+## Deployment
+
+This example provisions the TeamCity module into a new VPC freshly deployed resources from the module. A TeamCity server is deployed using an Amazon Elastic Container Service (ECS) service. The server will have an attached Elastic File System (EFS), which acts as a shared, persistent data store. The module also deploys an Amazon Aurora Serverless V2 Postgresql Cluster.
+
+To deploy this example please initialize the project with `terraform init`. Deployment is then as simple as `terraform apply`.

docs/media/images/teamcity-server-architecture.png

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+---
+title: TeamCity
+description: TeamCity Terraform module for game development on AWS
+---
+
+# TeamCity Server
+
+[Jump to Terraform docs](./terraform-docs.md){ .md-button .md-button--primary }
+
+[TeamCity](https://www.jetbrains.com/teamcity/) is a user-friendly continuous integration (CI) server for developers and build engineers created by JetBrains. This module deploys a TeamCity server on [AWS Elastic Container Service](https://aws.amazon.com/ecs/).
+
+The TeamCity server relies on shared file system for persistent storage of configuration, build results, and current operation files as well as a SQL database to store build history, user data, build results, and runtime data. This module provides these services by provisioning an [Amazon Elastic File System](https://aws.amazon.com/efs/) and an [Amazon Amazon Aurora Serverless V2](https://aws.amazon.com/rds/aurora/serverless/) cluster running the PostgreSQL engine.
+
+## Deployment Architecture
+![TeamCity Module Architecture](../../media/images/teamcity-server-architecture.png)

docs/modules/teamcity/examples/complete.md

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+# Terraform Module Docs
+--8<-- "modules/teamcity/README.md"