diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 00000000..fed4a895
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Gonzalo Diaz
+
+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.
\ No newline at end of file
diff --git a/README.md b/README.md
index 8dee7fcd..f876a3cc 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,22 @@
 
 Use this answers to learn some tip and tricks for algorithms tests.
 
+# How to use
+
+Run every problem using Node.js cli as following example:
+
+```
+node problem00001.js
+
+```
+
+Teste with:
+
+```
+node --version
+v16.0.0
+```
+
 # Why i publish solutions?
 
 As Project Euler says:
diff --git a/package.json b/package.json
new file mode 100644
index 00000000..05aa7e1b
--- /dev/null
+++ b/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "projecteuler.net",
+  "version": "1.0.0",
+  "description": "Solutions to the first 100 problems from [Project Euler](https://projecteuler.net/)",
+  "main": "problem0001.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Gonzalo Diaz <devel@gon.cl>",
+  "license": "MIT",
+  "type": "module"
+}