chore: import upstream snapshot with attribution

docs/source/Introduction/overview.rst

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+Overview
+========
+
+Our repository provides well-structured `APIs <https://github.com/FlagOpen/FlagEmbedding/tree/master/FlagEmbedding>`_ for the inference, evaluation, and fine-tuning of BGE series models.
+Besides that, there are abundant resources of  and  for users to quickly get a hands-on experience.
+
+.. figure:: https://raw.githubusercontent.com/FlagOpen/FlagEmbedding/refs/heads/master/imgs/projects.png
+   :width: 700
+   :align: center
+
+   Structure of contents in our `repo <https://github.com/FlagOpen/FlagEmbedding>`_
+
+Our repository provides well-structured contents for information retrieval and RAG:
+
+- The core `APIs <../API>`_ for embedding models' inference, evaluation, and fine-tuning.
+- Hands-on `examples <https://github.com/FlagOpen/FlagEmbedding/tree/master/examples>`_ for the three mentioned use cases.
+- Detailed `tutorials <https://github.com/FlagOpen/FlagEmbedding/tree/master/Tutorials>`_ covering topics in retrieval to help you learn from scratch.