feat: add testcontainers-oss quickstart guides (#22120)

- **chore: add testcontainers entry in the OSS section of Manuals**
- **chore: adds quickstarts for tc-go and tc-java**

<!--Delete sections as needed -->

## Description
This PR adds the Testcontainers OSS section in the Manuals > OSS section
of the docs.

It's adding the following pages:

- index page with a basic description of the project, with two cards:
  - why use testcontainers, linking to a benefits page
  - quicktart, linking to a folder with two pages: Go and Java

Below the cards grid, it links to the testcontainers.com/getting-started
page.

The benefits page includes some of the content of the above
getting-started page, and the Go and Java quickstart pages are copying
the quickstart pages from Go
(https://golang.testcontainers.org/quickstart/) and Java
(https://java.testcontainers.org/quickstart/) in its 3 flavours (junit4,
junit5 and spock)

<!-- Tell us what you did and why -->

## Related issues or tickets

<!-- Related issues, pull requests, or Jira tickets -->

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [x] Technical review
- [ ] Editorial review
- [x] Product review

---------

Co-authored-by: aevesdocker <allie.sadler@docker.com>

_vale/config/vocabularies/Docker/accept.txt

@@ -55,6 +55,7 @@ Intune
 JFrog
 Jamf
 JetBrains
+JUnit
 Kerberos
 Kitematic
 Kubeadm
@@ -80,6 +81,7 @@ Paketo
 Postgres
 PowerShell
 Python
+Ryuk
 S3
 SQLite
 Slack

content/manuals/_index.md

@@ -26,6 +26,10 @@ params:
     description: Define and run multi-container applications.
     icon: /assets/icons/Compose.svg
     link: /compose/
+  - title: Testcontainers OSS
+    description: Run containers programmatically in your preferred programming language.
+    icon: /assets/icons/Testcontainers.svg
+    link: /testcontainers/
   products:
   - title: Docker Desktop
     description: Your command center for container development.

content/manuals/testcontainers/_index.md

@@ -0,0 +1,58 @@
+---
+title: Testcontainers OSS
+description: Learn how to use Testcontainers OSS to run containers programmatically in your preferred programming language.
+keywords: docker APIs, docker, testcontainers documentation, testcontainers, testcontainers oss, testcontainers oss documentation,
+  docker compose, docker-compose, java, golang, go
+params:
+  sidebar:
+    group: Open source
+intro:
+- title: What is Testcontainers?
+  description: Learn about what Testcontainers does and its key benefits
+  icon: feature_search
+  link: https://testcontainers.com/getting-started/#what-is-testcontainers
+- title: The Testcontainers workflow
+  description: Understand the Testcontainers workflow 
+  icon: explore
+  link: https://testcontainers.com/getting-started/#testcontainers-workflow
+quickstart:
+- title: Testcontainers for Go
+  description: A Go package that makes it simple to create and clean up container-based dependencies for automated integration/smoke tests.
+  icon: /assets/icons/go.svg
+  link: https://golang.testcontainers.org/quickstart/
+- title: Testcontainers for Java
+  description: A Java library that supports JUnit tests, providing lightweight, throwaway instances of anything that can run in a Docker container.
+  icon: /assets/icons/java.svg
+  link: https://java.testcontainers.org/
+---
+
+Testcontainers is set libraries that provides easy and lightweight APIs for bootstrapping local development and test dependencies with real services wrapped in Docker containers.
+Using Testcontainers, you can write tests that depend on the same services you use in production without mocks or in-memory services.
+
+{{< grid items=intro >}}
+
+## Quickstart
+
+### Supported languages
+
+Testcontainers provide support for the most popular languages, and Docker sponsors the development of the following Testcontainers implementations:
+
+- [Go](https://golang.testcontainers.org/quickstart/)
+- [Java](https://java.testcontainers.org/quickstart/)
+
+The rest are community-driven and maintained by independent contributors.
+
+### Prerequisites
+
+Testcontainers requires a Docker-API compatible container runtime. 
+During development, Testcontainers is actively tested against recent versions of Docker on Linux, as well as against Docker Desktop on Mac and Windows. 
+These Docker environments are automatically detected and used by Testcontainers without any additional configuration being necessary.
+
+It is possible to configure Testcontainers to work for other Docker setups, such as a remote Docker host or Docker alternatives.
+However, these are not actively tested in the main development workflow, so not all Testcontainers features might be available
+and additional manual configuration might be necessary.
+
+If you have further questions about configuration details for your setup or whether it supports running Testcontainers-based tests,
+ contact the Testcontainers team and other users from the Testcontainers community on [Slack](https://slack.testcontainers.org/).
+
+ {{< grid items=quickstart >}}