app/platform: add initial platform service skeleton (#20679)

app/platform/config.go

@@ -0,0 +1,16 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package platform
+
+// ServiceConfig is used to initialize the PlatformService.
+// The mandatory fields will be checked during the initialization of the service.
+type ServiceConfig struct {
+	// Mandatory fields
+	// Optional fields
+}
+
+func (c *ServiceConfig) validate() error {
+	// Mandatory fields need to be checked here
+	return nil
+}

app/platform/service.go

@@ -0,0 +1,19 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package platform
+
+// PlatformService is the service for the platform related tasks. It is
+// responsible for non-entity related functionalities that are required
+// by a product such as database access, configuration access, licensing etc.
+type PlatformService struct {
+}
+
+// New creates a new PlatformService.
+func New(c ServiceConfig) (*PlatformService, error) {
+	if err := c.validate(); err != nil {
+		return nil, err
+	}
+
+	return &PlatformService{}, nil
+}