Added an example.

You can create a `.theia-example` folder in your workspace,
create a `tasks.json`, and put your tasks there.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

examples/api-samples/package.json

@@ -8,7 +8,8 @@
   },
   "theiaExtensions": [
     {
-      "frontend": "lib/browser/api-samples-frontend-module"
+      "frontend": "lib/browser/api-samples-frontend-module",
+      "backend": "lib/node/example-env-variables-module"
     }
   ],
   "keywords": [

examples/api-samples/src/node/example-env-variables-module.ts

@@ -0,0 +1,23 @@
+/********************************************************************************
+ * Copyright (C) 2020 TypeFox and others.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the Eclipse
+ * Public License v. 2.0 are satisfied: GNU General Public License, version 2
+ * with the GNU Classpath Exception which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ ********************************************************************************/
+
+import { ContainerModule } from 'inversify';
+import { EnvVariablesServer } from '@theia/core/lib/common/env-variables';
+import { ExampleEnvVariableServer } from './example-env-variables-server';
+
+export default new ContainerModule((bind, unbind, isBound, rebind) => {
+    rebind(EnvVariablesServer).to(ExampleEnvVariableServer).inSingletonScope();
+});

examples/api-samples/src/node/example-env-variables-server.ts

@@ -0,0 +1,27 @@
+/********************************************************************************
+ * Copyright (C) 2020 TypeFox and others.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the Eclipse
+ * Public License v. 2.0 are satisfied: GNU General Public License, version 2
+ * with the GNU Classpath Exception which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ ********************************************************************************/
+
+import { injectable } from 'inversify';
+import { EnvVariablesServerImpl } from '@theia/core/lib/node/env-variables';
+
+@injectable()
+export class ExampleEnvVariableServer extends EnvVariablesServerImpl {
+
+    get configDirName(): string {
+        return '.theia-example';
+    }
+
+}