Add Composer integration.

.gitignore

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+/vendor/

composer.json

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+{
+    "authors": [
+        {
+            "name": "Frederic G. MARAND",
+            "email": "fgm@osinet.fr"
+        }
+    ],
+    "description": "Export and re-import the contents of a Drupal site.",
+    "license": "GPL-2.0+",
+    "minimum-stability": "dev",
+    "name": "drupal/reinstall",
+    "require": {
+        "drupal/migrate_plus": "^2.0",
+        "drupal/migrate_tools": "^3.0"
+    },
+    "type": "drupal-module"
+}