Add GCloud module (#733)

Author: anietieasuquo

docs/modules/gcloud.md

@@ -0,0 +1,28 @@
+# GCloud Module
+
+Testcontainers module for the Google Cloud Platform's [Cloud SDK](https://cloud.google.com/sdk/).
+
+## Install
+
+```bash
+npm install @testcontainers/gcloud --save-dev
+```
+
+
+Currently, the module supports `Firestore` emulators. In order to use it, you should use the following classes:
+
+Class | Container Image
+-|-
+FirestoreEmulatorContainer | [gcr.io/google.com/cloudsdktool/google-cloud-cli:emulators](https://gcr.io/google.com/cloudsdktool/google-cloud-cli)
+
+## Examples
+
+### Firestore
+
+<!--codeinclude-->
+[Starting a Firestore Emulator container with the default image](../../packages/modules/gcloud/src/firestore-emulator-container.test.ts) inside_block:firestore4
+<!--/codeinclude-->
+
+<!--codeinclude-->
+[Starting a Firestore Emulator container with a custom emulator image](../../packages/modules/gcloud/src/firestore-emulator-container.test.ts) inside_block:firestore5
+<!--/codeinclude-->

mkdocs.yml

@@ -45,6 +45,7 @@ nav:
       - ArangoDB: modules/arangodb.md
       - Couchbase: modules/couchbase.md
       - Elasticsearch: modules/elasticsearch.md
+      - GCloud: modules/gcloud.md
       - HiveMQ: modules/hivemq.md
       - Kafka: modules/kafka.md
       - Localstack: modules/localstack.md