Update README.md to include project overview, development notes, and contract descriptions

Author: JesusRgil

README.md

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 # ProjectFactory
+
+ProjectFactory is a Solidity-based project management system that allows the creation and management of projects with milestones. Each project can have multiple milestones, and the owner can add, complete, and approve these milestones.
+
+## Development
+
+The development of this project is planned and tracked in the testing branches. These branches contain the latest features and improvements under development.
+
+## Contracts
+
+- `Project`: Manages project milestones.
+- `ProjectFactory`: Creates and manages multiple projects.
+
+## Documentation
+
+For detailed API documentation, refer to the [ProjectFactory Documentation](docs/ProjectFactory.md).