Add README for FederatedCode client

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

aboutcode/federatedcode/README.rst

@@ -0,0 +1,35 @@
+=======================
+aboutcode.federatedcode
+=======================
+
+|license| |build|
+
+.. |license| image:: https://img.shields.io/badge/License-Apache--2.0-blue.svg?style=for-the-badge
+    :target: https://opensource.org/licenses/Apache-2.0
+
+.. |build| image:: https://img.shields.io/github/actions/workflow/status/aboutcode-org/federatedcode/main.yml?style=for-the-badge&logo=github
+
+This is a library of FederatedCode client utilities to fetch and subscribe package metadata.
+
+
+License
+=======
+
+Copyright (c) nexB Inc. and others. All rights reserved.
+
+SPDX-License-Identifier: Apache-2.0
+
+See https://aboutcode.org for more information about AboutCode OSS projects.
+
+.. code-block:: none
+
+    You may not use this software except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://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.