Added README.md file

docs/README.md

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+<!--
+ * Copyright (c) 2024 Robert Bosch Manufacturing Solutions GmbH
+ * Copyright (c) 2024 Contributors to the Eclipse Foundation
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Apache License, Version 2.0 which is available at
+ * https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+-->
+
+# Introduction
+Following documentation is available:
+
+| Documentation                            | Purpose                                          |
+|------------------------------------------|--------------------------------------------------|
+| [Arc42](architecture/)                   | Architecture documentation for the Semantic Hub. |