Add README.md, LICENSE and SECURITY.md (#1)

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2023 Software Mansion <swmansion.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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-# scarb-nightlies
-This repository stores nightly builds of Scarb, go to Releases to obtain them
+<p align="center">
+<picture>
+<source media="(prefers-color-scheme: dark)" srcset="./scarb-dark.svg">
+<img width="128" height="128" src="./scarb-light.svg">
+</picture>
+</p>
+
+<h1 align="center">Scarb Nightlies</h1>
+
+This repository stores nightly builds of Scarb.
+They are built on top of Scarb's and Cairo compiler's latest `main` branches.
+Consult release notes for exact commit hashes and more information.
+Each build is identified by calendar day it was produced, and are tagged in the following
+pattern: `nightly-YYYY-MM-DD`, for example: `nightly-2023-08-03`.
+
+These builds are created automatically, unattended.
+**Use at your own risk.**
+
+* [Go to latest nightly release →](https://github.com/software-mansion/scarb-nightlies/releases/latest)
+* [Go to all nightlies →](https://github.com/software-mansion/scarb-nightlies/releases)
+---
+* [Go to Scarb main repository →](https://github.com/software-mansion/scarb)
+* Found a bug? [Please report it to Scarb's issue tracker →](https://github.com/software-mansion/scarb/issues/new/choose)

SECURITY.md

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+# Security Policy
+
+These automatic builds are based on latest revisions of Scarb and Cairo compiler.
+We do our best to ensure their safety, but due to their unattended nature Scarb team
+does not support and will not provide security updates for nightly builds.
+
+In other cases, please follow [Scarb Security Policy](https://github.com/software-mansion/scarb/security/policy).