feat: Standardize configurations

Relates to #39 (closed)

src/main/java/org/eclipsefoundation/wg/config/WorkingGroupsConfig.java

+/*********************************************************************
+* Copyright (c) 2023 Eclipse Foundation.
+*
+* This program and the accompanying materials are made
+* available under the terms of the Eclipse Public License 2.0
+* which is available at https://www.eclipse.org/legal/epl-2.0/
+*
+* Author: Zachary Sabourin <zachary.sabourin@eclipse-foundation.org>
+*
+* SPDX-License-Identifier: EPL-2.0
+**********************************************************************/
+package org.eclipsefoundation.wg.config;
+
+import io.smallrye.config.ConfigMapping;
+import io.smallrye.config.WithDefault;
+
+/**
+ * Contains all custom configs used by this application. Includes the location
+ * of the working groups static file, as well as the default committee member
+ * relation type.
+ */
+@ConfigMapping(prefix = "eclipse.working-groups")
+public interface WorkingGroupsConfig {
+
+    @WithDefault(value = "working_groups.json")
+    String filepath();
+
+    @WithDefault(value = "ME")
+    String relationType();
+}