Feature/typescript conversion (#1)

* Removed demo and test files;

* Added editor and typescript config files;
Added package.json;
Improved .gitignore with common contents;

* Converted sudoku.js to typescript;
Added enums and interfaces;
Added sudoku.js as legacy;

.editorconfig

@@ -0,0 +1,16 @@
+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.gitignore

@@ -1,3 +1,32 @@
+# Specifies intentionally untracked files to ignore when using Git
+# http://git-scm.com/docs/gitignore
+
+*~
+*.sw[mnpcod]
+.tmp
+*.tmp
+*.tmp.*
+*.sublime-project
+*.sublime-workspace
+.DS_Store
+Thumbs.db
+UserInterfaceState.xcuserstate
+$RECYCLE.BIN/
+
+*.log
+log.txt
+npm-debug.log*
+
+/.git
+/.idea
+/.sass-cache
+/.sourcemaps
+/.versions
+/.vscode
+/coverage
+/dist
+/node_modules
+
 .c9revisions
 ref
 archive