docs: add roadmap file

ROADMAP.md

@@ -0,0 +1,18 @@
+# Lucid Roadmap
+
+The document contains the list of features that must be completed before the alpha release and the final release as well.
+
+## Alpha Release
+
+- [ ] Complete `ManyToMany.sync` method.
+- [ ] Implement `fetchOrCreateMany`, `updateOrCreateMany`, `firstOrCreate` and `updateOrCreate` for all relationships.
+- [ ] Add support for default value for `@columns`.
+- [ ] Related models aggregrates query.
+- [ ] Support for casting columns using a custom function. Both on column and model level.
+
+## Final Release targeting `@adonisjs/core v5`
+
+- [ ] Add robuts layer for dealing with Dates and DateTimes, along with Timezone.
+- [ ] Add support for query scopes. `Global` and `Local` both.
+- [ ] Add support for data factories.
+- [ ] Support for global transactions.