update LICENSE.md with provenance

LICENSE.md

@@ -1,6 +1,8 @@
 Apache License
 --------------
 
+FlutterSwift, with the exception of the third-party code described elsewhere in this file, is subject to the following license:
+
 ```
 Copyright (c) 2023-2024 PADL Software Pty Ltd
 
@@ -17,6 +19,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ```
 
+The file `Locking.swift` comes from the Swift Async Algorithms open source project:
+
 ```
 //===----------------------------------------------------------------------===//
 //
@@ -29,10 +33,14 @@ limitations under the License.
 //
 //===----------------------------------------------------------------------===//
 ```
+
 Flutter License
 ---------------
 
-Copyright 2023 The Flutter Authors. All rights reserved.
+API description comments are from the original Flutter source code:
+
+```
+Copyright 2023-2024 The Flutter Authors. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 
@@ -41,12 +49,14 @@ Redistribution and use in source and binary forms, with or without modification,
     * Neither the name of the Flutter Authors nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+```
 
 MIT License
 -----------
 
 The standard channel encoder is based on [swift-binary-coder](https://github.com/fwcd/swift-binary-coder), which is subject to the following license: 
 
+```
 Copyright (c) 2022 fwcd
 Portions Copyright (c) 2023 PADL Software Pty Ltd dba Lukktone
 
@@ -55,4 +65,5 @@ Permission is hereby granted, free of charge, to any person obtaining a copy of
 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+```