Add README.md (#38)

Signed-off-by: Marek Kaput <marek.kaput@outlook.com>
Co-authored-by: Jan Smółka <jp.smolka@gmail.com>
Co-authored-by: Tomasz Rejowski <34059895+Arcticae@users.noreply.github.com>

Author: 3 people

README.md

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+# CairoLS
+
+CairoLS is an implementation of [Language Server Protocol][LSP] for the [Cairo] language.
+Cairo is the first Turing-complete language for creating provable programs for general computation.
+
+## Quick start
+
+CairoLS is distributed along with the [Scarb] package manager.
+To get started, install Scarb and the Cairo extension for your editor.
+
+For Visual Studio Code, install
+the Visual Studio Code [Cairo 1.0](https://marketplace.visualstudio.com/items?itemName=starkware.cairo1) extension
+from the marketplace.
+
+For other editors that support LSP,
+you can point the editor to the `scarb cairo-language-server` command to start the server.
+
+## Support
+
+For questions about CairoLS and official editor extensions, reach out to us on [Telegram].
+
+[Cairo]: https://www.cairo-lang.org/
+
+[LSP]: https://microsoft.github.io/language-server-protocol/
+
+[Scarb]: https://docs.swmansion.com/scarb
+
+[Telegram]: https://t.me/cairo_ls_support