chore: add gruntfile which includes grunt release task

.gitignore

@@ -0,0 +1,3 @@
+node_modules/
+.DS_Store
+.idea/

Gruntfile.js

@@ -0,0 +1,62 @@
+module.exports = function ( grunt ) {
+
+    grunt.initConfig( {
+
+        release: {
+            options: {
+                bump: true, //default: true
+                changelog: false, //default: false
+                file: 'package.json', //default: package.json
+                add: false, //default: true
+                commit: false, //default: true
+                tag: true, //default: true
+                push: false, //default: true
+                pushTags: false, //default: true
+                npm: false, //default: true
+                tagName: 'v<%= version %>', //default: '<%= version %>'
+                commitMessage: 'release <%= version %>', //default: 'release <%= version %>'
+                tagMessage: 'Version <%= version %>', //default: 'Version <%= version %>',
+                beforeBump: [], // optional grunt tasks to run before file versions are bumped
+                afterBump: [
+                    'conventionalChangelog'
+                ], // optional grunt tasks to run after file versions are bumped
+                beforeRelease: [], // optional grunt tasks to run after release version is bumped up but before release is packaged
+                afterRelease: [], // optional grunt tasks to run after release is packaged
+                updateVars: [] // optional grunt config objects to update (this will update/set the version property on the object specified)
+            }
+        },
+
+        conventionalChangelog: {
+            options: {
+                changelogOpts: {
+                    // conventional-changelog options go here
+                    preset: 'angular'
+                },
+                context: {
+                    // context goes here
+                },
+                gitRawCommitsOpts: {
+                    // git-raw-commits options go here
+                },
+                parserOpts: {
+                    // conventional-commits-parser options go here
+                },
+                writerOpts: {
+                    // conventional-changelog-writer options go here
+                }
+            },
+            release: {
+                src: 'CHANGELOG.md'
+            }
+        }
+
+    } );
+
+    grunt.loadNpmTasks( 'grunt-release' );
+    grunt.loadNpmTasks( 'grunt-conventional-changelog' );
+
+    grunt.registerTask( 'default', [
+        'release'
+    ] );
+
+};