Add initial classes and a couple of tests for Board

.editorconfig

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+root = true
+
+[*.cr]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

.gitignore

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+/docs/
+/lib/
+/bin/
+/.shards/
+*.dwarf

.travis.yml

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+language: crystal
+
+# Uncomment the following if you'd like Travis to run specs and check code formatting
+# script:
+#   - crystal spec
+#   - crystal tool format --check

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2019 Alberto Venturini
+
+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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+# sudoku
+
+TODO: Write a description here
+
+## Installation
+
+TODO: Write installation instructions here
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Development
+
+TODO: Write development instructions here
+
+## Contributing
+
+1. Fork it (<https://github.com/your-github-user/sudoku/fork>)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request
+
+## Contributors
+
+- [Alberto Venturini](https://github.com/your-github-user) - creator and maintainer

shard.yml

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+name: crystal-sudoku
+version: 0.1.0
+
+authors:
+  - Alberto Venturini <aventurini@gmail.com>
+
+targets:
+  sudoku:
+    main: src/sudoku.cr
+
+crystal: 0.31.1
+
+license: MIT

spec/board_spec.cr

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+require "./spec_helper"
+
+describe Sudoku::Board do
+
+  it "initialized grid with nil values" do
+    board = Sudoku::Board.new(8, 8)
+    board.get(0, 0).should eq nil
+  end
+
+  it "puts numbers correctly" do
+    board = Sudoku::Board.new(8, 8)
+    board.put(1, 0, 0)
+    board.get(0, 0).should eq 1
+  end
+
+end

spec/spec_helper.cr

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+require "spec"
+require "../src/sudoku.cr"

spec/sudoku_spec.cr

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+require "./spec_helper"
+
+describe Sudoku do
+
+end

src/board.cr

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+
+module Sudoku
+
+  class Board
+
+    alias Value = Nil | Int8
+
+    enum State
+      Valid
+      Invalid
+    end
+
+    getter grid
+
+    def initialize(@width : Int8, @height : Int8)
+      @grid = Array(Value).new(@width * @height, nil)
+    end
+
+    def put(value : Value, x, y)
+      @grid[y * @width + x] = value
+    end
+
+    def get(x, y)
+      @grid[y * @width + x]
+    end
+      
+  end
+
+end

src/parser.cr

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+module Sudoku
+  # Parse a sudoku board from a string. Return a board.
+  class Parser
+    def self.parse(board_str)
+    end
+  end
+end

src/position.cr

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+module Sudoku
+
+  struct Position
+    
+  end
+
+end

src/solver.cr

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+module Sudoku
+  class Solver
+    def self.solve(board)
+    end
+  end
+end

src/sudoku.cr

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+# TODO: Write documentation for `Sudoku`
+
+require "./*"
+
+module Sudoku
+  VERSION = "0.1.0"
+end