docs: round-robin algorithm

standalone-apis/node-load-balancing-sample/README.md

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 # Node.js and Load Balancing Sample
+
+## Algorithms
+
+## Round-Robin
+
+The round-robin algorithm is a straightforward and widely used technique for load balancing. It distributes incoming client requests sequentially and evenly across a pool of available servers in a cyclical manner.
+
+- Initial Request: The first client request is sent to the first server in the pool.
+- Subsequent Requests: Each subsequent request is sent to the next server in the list, cycling back to the first server once the last server has been reached.
+- Continuous Cycle: This process repeats indefinitely, ensuring that all servers receive an equal number of requests over time.
+- Even Distribution: Ensures all servers receive a similar load, assuming requests are of equal weight.
+- Stateless: Doesn't require tracking client-server mappings.
+
+**Illustration**
+
+- Assume you have 3 servers: S1, S2, and S3.
+- Incoming requests: R1, R2, R3, R4, R5, R6.
+
+The round-robin distribution will be:
+
+- R1 → S1
+- R2 → S2
+- R3 → S3
+- R4 → S1 (cycle restarts)
+- R5 → S2
+- R6 → S3