temporary ReadMe for the Polkadot SDK

README.md

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+Welcome to our new repository! As long anticipated, we have finally merged all three repositories (Cumulus, Polkadot and Substrate) into a single unified entity, marking a significant milestone in our journey.
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+To ensure a seamless transition to our new environment, we highly recommend taking a moment to explore our FAQ section. You can find comprehensive information about the merge [here](https://polkadot-public.notion.site/Polkadot-SDK-FAQ-fbc4cecc2c46443fb37b9eeec2f0d85f)
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+Should you encounter technical queries concerning the migration, we encourage you to carefully review [our ongoing discussions](https://github.com/paritytech/polkadot-sdk/discussions/categories/migration-to-the-new-repository) and consider opening a new topic if your specific question hasn't been addressed yet.
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+For inquiries of a different nature, be it organizational or philosophical, we invite you to engage in the [conversation on our forum](https://forum.polkadot.network/t/psa-parity-is-currently-working-on-merging-the-polkadot-stack-repositories-into-one-single-repository/2883).
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+Thanks for your participation! Feel free to show your support for our project by giving this new repository a star ⭐️. Your active involvement matters as we embark on this exciting new phase together.