(alexcmgit#1) Add initial code and tests

.gitignore

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+.vscode/
+.dart_tool/
+
+# This is a library package:
+# https://stackoverflow.com/questions/16136739/in-dart-and-pub-should-i-add-pubspec-lock-to-my-gitignore.
+pubspec.lock

LICENSE

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+MIT License
+
+Copyright (c) 2023 Alex Rintt
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+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.

README.md

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+Fork of: https://github.com/lubert/chess.ts.
+
+The original repository is written in TypesScript but this fork was rewritten in Dart.
+
+All credits goes to the original author.
+
+---
+
+This library aims to provide a rich and simple API to generate chess moves and validate board. This also support `FEN` and `PGN` to import or export chess matches.
+
+# Why another chess engine?
+
+Although there are some other Dart-based libraries for chess, I did not found one that:
+
+- Has built-in customizable game engines to allow `vs computer`-like features, which will be the focus of this library on `v0.2.0`.
+- Is up-to-date with latest Dart code style guides.
+- Is designed to be fully functional and stateless (immutable).
+
+# Docs
+
+Soon... **this is a work in progress**.

analysis_options.yaml

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+# This file configures the analyzer to use the lint rule set from `package:lint`
+
+include: package:lint/strict.yaml # For production apps
+# include: package:lint/casual.yaml # For code samples, hackathons and other non-production code
+# include: package:lint/package.yaml # Use this for packages with public API
+
+# You might want to exclude auto-generated files from dart analysis
+analyzer:
+  exclude:
+    #- '**.freezed.dart'
+    #- '**.g.dart'
+
+# You can customize the lint rules set to your own liking. A list of all rules
+# can be found at https://dart-lang.github.io/linter/lints/options/options.html
+linter:
+  rules:
+    # Util classes are awesome!
+    # avoid_classes_with_only_static_members: false
+
+    # Make constructors the first thing in every class
+    # sort_constructors_first: true
+
+    # Choose wisely, but you don't have to
+    # prefer_double_quotes: true
+    # prefer_single_quotes: true
+    always_specify_types: true
+    always_use_package_imports: false
+    avoid_relative_lib_imports: false
+    avoid_package_lib_imports: true
+    prefer_relative_imports: true