chore: update readme diagram (#23)

README.md

@@ -11,6 +11,7 @@ This DBResolver library will split your connections to correct defined DBs. Eg,
 
 Read more for the explanation on this [blog post](https://betterprogramming.pub/create-a-cross-region-rdbms-connection-library-with-dbresolver-5072bed6a7b8)
 
+Excalidraw live [diagram](https://excalidraw.com/#json=DTs8yxHOGF6uLkjnZny4z,RVo8iwhO0Rk6DRGkKuNZTg)
 ### Usecase 1: Separated RW and RO Database connection
 
 <details open>
@@ -21,7 +22,7 @@ Read more for the explanation on this [blog post](https://betterprogramming.pub/
 - Your application is heavy on read operations
 - Your DBs replicated to multiple replicas for faster queries
 - You separate the connections for optimized query
-- ![image](https://user-images.githubusercontent.com/11002383/180010864-c9e2a0b6-520d-48d6-bf0d-490eb070e75d.png)
+- ![readonly-readwrite](https://user-images.githubusercontent.com/11002383/206952018-dd393059-c42c-4ffc-913a-f21c3870bd80.png)
 
 </details>
 
@@ -33,7 +34,18 @@ Read more for the explanation on this [blog post](https://betterprogramming.pub/
 
 - Your application deployed to multi regions.
 - You have your Databases configured globally.
-- ![image](https://user-images.githubusercontent.com/11002383/179894026-7206cbb8-35d7-4fd9-9ce9-4e62bf1ec156.png)
+- ![cross-region](https://user-images.githubusercontent.com/11002383/206952598-ed21a6f8-5542-4f26-aaa6-67d9c2aa5940.png)
+
+</details>
+
+### Usecases 3: Multi-Master (Multi-Primary) Database
+
+<details open>
+
+<summary>Click to Expand</summary>
+
+- You're using a Multi-Master database topology eg, Aurora Multi-Master
+- ![multi-master](https://user-images.githubusercontent.com/11002383/206953082-c2b1bfa8-050e-4a6e-88e8-e5c7047edd71.png)
 
 </details>