Introduced help fnc for database

helpfunctions/addgroup.js

@@ -0,0 +1,27 @@
+//Checking if group existis in DB table groups 
+//if no inserts new group with no users (implicitly)
+const handleAddGroup = (reqgroup, db) => {
+    db.transaction (trx => {
+        trx.select('groupname')
+        .from('groups')
+        .where('groupname', 'ilike', reqgroup)
+        .then ( data => {
+            if (data.length===0) {
+                return trx('groups')
+                .returning('*')
+                .insert( {
+                    groupname: reqgroup,
+                    username: ''
+                })
+                .then(group => {
+                    console.log('Inserted new empty group implicitly.');
+                })
+            }
+        })
+        .then(trx.commit)
+        .catch(trx.rollback)
+    })
+}
+module.exports = {
+    handleAddGroup
+}