feat: added README with setup and contributing instructions

README.md

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+## Introduction
+The purpose of the ANI Report LaTeX repository is to provide a LaTeX template to aid researchers and project managers/coordinators in producing high-quality reports for the Portuguese National Agency for Innovation. This template is derived from [ERDC](https://ctan.org/pkg/erdc) and adapted to the ANI document structure.
+
+## Usage
+This template should be trivial for anyone familiar with LaTeX to use. Type `make` in the shell to generate the sample PDF. If an error occurs, please review the log to determine which packages are missing.
+
+## Contributing
+Create a branch to perform the required modifications. After submitting a pull request, please tag repository maintainers for evaluation and further consideration.