Add minimal readme

Author: AntonioND

readme.md

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+The documentation of BlocksDS is [here](https://blocksds.skylyrac.net/docs/).
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+For an introduction to programming the Nintendo DS, check [this tutorial](https://blocksds.skylyrac.net/manual/).
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+[This](https://github.com/blocksds/awesome-blocksds) is a list of interesting projects made with BlocksDS.
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+The GitHub organization is [here](https://github.com/blocksds).
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+If you want to report issues, do it [here](https://github.com/blocksds/sdk/issues).