added composer file to install drush when needed

.gitignore

@@ -27,3 +27,5 @@ typescript
 
 sync_uploads
 
+vendor
+

composer.json

@@ -0,0 +1,10 @@
+{
+    "require": {
+        "drush/drush": "8.*"
+    },
+    "extra": {
+        "installer-paths": {
+            "core": ["type:drupal-core"]
+        }
+    }
+}