docs(readme): add limitations section

Author: shubhamp-sf

README.md

@@ -4,6 +4,8 @@
 
 This is a loopback 4 extension that provides Sequelize powered repository methods which is more performant than juggler (the default ORM in Loopback) for relational databases.
 
+For pending features, refer to the [Limitations](#limitations) section below.
+
 ## Installation
 
 ```sh
@@ -47,6 +49,16 @@ export class YourRepository extends SequelizeRepository<
 }
 ```
 
+## Limitations
+
+Please note, the current implementation does not support the following:
+
+1. Relational Query Support (currently only basic CRUD is supported with loopback style filters).
+2. SQL Transactions.
+3. Sequelize Powered Migrations.
+
+Community contribution is welcome.
+
 ## Feedback
 
 If you've noticed a bug or have a question or have a feature request, [search the issue tracker](https://github.com/sourcefuse/loopback4-sequelize/issues) to see if someone else in the community has already created a ticket.