diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..0c4bf4f
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,21 @@
+# How to contribute ?
+
+## How to build the project ?
+
+### With Gradle
+
+Use this command line :
+
+```bash
+./gradlew clean build
+```
+
+## How to run test ?
+
+### With Gradle
+
+Use this command line :
+
+```bash
+./gradlew test
+```
\ No newline at end of file