Add ministack (#179)

Author: Nahuel990

ministack/index.md

@@ -0,0 +1,17 @@
+---
+title: MiniStack
+categories:
+  - cloud
+docs:
+  - id: java
+    url: https://github.com/ministackorg/testcontainers-ministack
+    maintainer: official
+    example: |
+      ```java
+      var ministack = new MiniStackContainer("latest");
+      ministack.start();
+      String endpoint = ministack.getEndpoint();
+      ```
+description: |
+  MiniStack is a free, open-source local AWS emulator. It runs 40+ AWS services on a single port (4566) — S3, SQS, SNS, DynamoDB, Lambda, IAM, CloudFormation, and more. Drop-in compatible with boto3, AWS CLI, Terraform, CDK, and any AWS SDK. MIT licensed.
+---