refactor project structure, implement tessellator

src/js/net/minecraft/util/Keyboard.js

@@ -0,0 +1,20 @@
+window.Keyboard = class {
+
+    static state = {};
+
+    static create() {
+        window.addEventListener('keydown', function (event) {
+            Keyboard.state[event.code] = true;
+            //console.log("Key " + event.code + " down");
+        });
+        window.addEventListener('keyup', function (event) {
+            delete Keyboard.state[event.code];
+            //console.log("Key " + event.code + " up");
+        });
+    };
+
+    static isKeyDown(key) {
+        return Keyboard.state[key];
+    }
+
+}