Add initial README with package description and directory structure

Author: MervinPraison

src/praisonai/README.md

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+# PraisonAI Package
+
+This is the PraisonAI package, which serves as a wrapper for PraisonAIAgents.
+
+It provides a simple and intuitive interface for working with AI agents and their capabilities.
+
+## Directory Structure
+
+The main package code is located in the `praisonai` subdirectory.