Add package.json

+{
+  "name": "condorcet",
+  "version": "0.1.0",
+  "description": "JavaScript implementation of Condorcet method.",
+  "author": {
+    "name": "Techniv",
+    "email": "contact@techniv.fr"
+  },
+  "main": "./dist/condorcet.js",
+  "repository": {
+    "type": "git",
+    "url": "http://gitlab.techniv.fr/Techniv/condorcet-js"
+  },
+  "bugs": {
+    "url": "http://gitlab.techniv.fr/Techniv/condorcet-js/issues"
+  },
+  "devDependencies": {
+    "gulp": "*",
+    "gulp-babel": "*",
+    "gulp-replace": "*",
+    "gulp-rename": "*",
+    "del": "*",
+    "babel-preset-es2015": "*",
+    "mocha": "*"
+  },
+  "scripts": {
+    "build": "./node_modules/.bin/gulp build",
+    "test": "./node_modules/.bin/mocha bdd tests/node/**/*Spec.js"
+  },
+  "engines": {
+    "node": ">=6.9.*"
+  }
+}
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