Documentation: Add the request to add Speedb's license when modifying…

… an existing RocksDB file (#744)

CONTRIBUTING.md

@@ -162,6 +162,8 @@ A license is required at the top of all documents and files.
 
 ### Source files
 
+#### New Source Files
+
 Every new source file should have the following header at the top:
 
 ```
@@ -182,6 +184,37 @@ limitations under the License.
 
 Replace `<year>` in the copyright notice above with the current year.
 
+#### RocksDB Source Files
+
+When modifying files that exist in RocksDB that already have a Facebook or LevelDB license header 
+Add the following header at the top, **preceding the Facebook and/or LevelDB license header** as follows:
+
+```
+Copyright (C) <year> Speedb Ltd. All rights reserved.
+
+Licensed 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.
+
+Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+ This source code is licensed under both the GPLv2 (found in the
+ COPYING file in the root directory) and Apache 2.0 License
+ (found in the LICENSE.Apache file in the root directory).
+Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file. See the AUTHORS file for names of contributors.
+```
+
+Replace `<year>` in the copyright notice above with the current year.
+
 ### Markdown
 
 Markdown files should have at the top:

HISTORY.md

@@ -38,6 +38,7 @@ Based on RocksDB 8.1.1
 
 ### Miscellaneous
 * Unit tests: Disable CancelCompactionWaitingOnConflict and CompactionLimiter in db_compaction_test since they sometimes fail or get stuck. These need to be investigated and reenabled (#711).
+* Documentation: Update CONTRIBUTING.md guide to request contributors to add Speedb's license when modifying existing Rocksdb Files (#713).
 
 ## Grapes v2.6.0 (8/22/2023)
 Based on RocksDB 8.1.1