chore: add contributing file (#27)

Author: MrPowers

CONTRIBUTING.md

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+<!--
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements.  See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership.  The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file 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.
+ -->
+
+# How to contribute to Apache SedonaDB
+
+Welcome!  We'd love to have you contribute to Apache SedonaDB!
+
+## Did you find a bug?
+
+Create an issue with a reproducible example.  Please specify the SedonaDB version with a code snippet and error message.
+
+## Did you create a PR to fix a bug?
+
+See [here](https://sedona.apache.org/latest/community/rule/#make-a-pull-request) for instructions on how to open PRs.
+
+We appreciate bug fixes - thank you in advance!
+
+## Would you like to add a new feature or change existing code?
+
+If you would like to add a feature or change existing behavior, please make sure to create an issue ticket and get the planned work approved by the core team first!
+
+It's always better to get aligned with the core devs before writing any code.
+
+## Do you have questions about the source code?
+
+Feel free to create an issue or join the [Discord](https://discord.gg/9A3k5dEBsY) with questions!
+
+Thanks for reading and looking forward to collaborating with you!