Added framework as a flattened directory

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
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+# Mbed TLS framework
+
+This repository contains a version-independent build and test framework for [TF-PSA-Crypto](https://github.com/Mbed-TLS/TF-PSA-Crypto) and [Mbed TLS](https://github.com/Mbed-TLS/mbedtls-framework).
+
+You need this repository as a Git submodule in a branch of one of the above repositories if:
+
+* You want to build, test or contribute to Mbed TLS 3.6.0 or above, and you are working from a snapshot of a Git commit on a development branch.
+* You want to build, test or contribute to TF-PSA-Crypto, and you are working from a snapshot of a Git commit on a development branch.
+
+You do not need this repository if:
+
+* You are working with Mbed TLS 2.28.
+* You want to build a release of Mbed TLS and run its unit tests.
+
+Contributing
+------------
+
+We gratefully accept bug reports and contributions from the community. Please see the [contributing guidelines](CONTRIBUTING.md) for details on how to do this.
+
+License
+-------
+
+Unless specifically indicated otherwise in a file, Mbed TLS framework files are provided under a dual [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) OR [GPL-2.0-or-later](https://spdx.org/licenses/GPL-2.0-or-later.html) license. See the [LICENSE](LICENSE) file for the full text of these licenses, and [the 'License and Copyright' section in the contributing guidelines](CONTRIBUTING.md#License-and-Copyright) for more information.
+