Add poolside-specific README (#1)

* Add poolside-specific README and a change list

README.md

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+This is a poolside-specific fork of pytorch. For now we do not have any custom code, only some changes to CI/build workflows.
+See [poolside.md](poolside.md) for more info about this fork.
+
+--------------------------------------------------------------------------------
+
 ![PyTorch Logo](https://github.com/pytorch/pytorch/raw/main/docs/source/_static/img/pytorch-logo-dark.png)
 
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poolside-changes.md

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+# poolside changes compared to upstream:
+* [16th Dec 2024] Added READMEs describing this fork. [PR](https://github.com/poolsideai/pytorch/pull/1).

poolside.md

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+# poolside's fork of pytorch
+
+Why this fork?
+* We might need to fix problems with pytorch that block or slowdown training of our models.
+* We don't want to wait until such problems are fixed in the upstream.
+* We need custom build configurations anyway.
+
+With that said, we don't want to maintain a completely separate version of pytorch.
+
+To avoid this, we try to follow these principles:
+* Updating to the current upstream should not be problematic and we should do it often.
+* If we commit any changes:
+  * We should minimize potential breaking changes/conflicts with the upstream.
+  * If the risk for potential conflicts is significant, we should consider commiting the changes to the upstream.
+
+## Repository organisation:
+Right now we have two branches:
+* `main` -- follows the `main` branch of the upstream
+* `poolside-main` -- contains our changes and should be rebased over `main`
+
+We commit our changes to `poolside-main`.
+If we want to commit our changes to the upstream, we branch from `main` and cherry-pick the corresponding commits from `poolside-main`.
+
+The changes we made should be summarized in the [poolside-changes.md](poolside-changes.md) file.
+
+Feel free to contact Dmitrii Emelianenko or Vadim Markovtsev for any questions regarding this repo.
+