Adding openlit to developer tools in the README.md

[AmanAgarwal041]

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Adding OpenLIT to developer tools section.

Brief introduction about OpenLIT : OpenLIT is an OpenTelemetry-native GenAI and LLM Application Observability tool. It's designed to make the integration process of observability into GenAI projects as easy as pie – literally, with just a single line of code. To explore more checkout https://github.com/openlit/openlit