added endpoints to readme for roadmap

README.md

@@ -1,2 +1,34 @@
 # OSI-API
 Open Source Invoice API
+
+
+#### Endpoints
+- Invoice
+  - create
+  - update
+  - delete
+- PO
+  - create
+  - update
+  - delete
+- Clients
+  - create
+  - update
+  - delete
+- Reports
+  - Income
+    - by Client
+  - Expenses
+    - by Type
+- Expenses
+  - Create
+  - Update
+  - delete
+- Users
+  - create
+  - update
+  - delete
+- Payments
+  - create
+  - update
+  - delete