Add license for code and “packages” directory (#2)

Author: remi

LICENSE.md

@@ -0,0 +1,26 @@
+Copyright (c) 2022, Mirego
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+- Redistributions of source code must retain the above copyright notice,
+  this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+- Neither the name of the Mirego nor the names of its contributors may
+  be used to endorse or promote products derived from this software without
+  specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -12,3 +12,11 @@ This repository intends to be used as a replacement for [dependabot/elixir-secur
 The _actual reason_ we (Mirego) need a public GitHub repository of Elixir security advisories, is because of [MixAudit](https://github.com/mirego/mix_audit), the tool we built to make sure our Elixir projects are scanned for potential vulnerabilities. MixAudit needs to be ran anonymously and locally (or in continuous integration) by anyone, so it cannot use GitHub GraphQL API’s [`securityVulnerabilities` query](https://docs.github.com/en/graphql/reference/queries#securityvulnerabilities) since it requires authentication.
 
 This is why, every 6 hours, through [this workflow](https://github.com/mirego/elixir-security-advisories/blob/master/.github/workflows/cd.yml), the `packages` directory is synced with GitHub Advisory Database 🎉
+
+## License
+
+`elixir-security-advisories` is © 2022 [Mirego](https://www.mirego.com) and may be freely distributed under the [New BSD license](http://opensource.org/licenses/BSD-3-Clause). See the [`LICENSE.md`](https://github.com/mirego/elixir-security-advisories/blob/master/LICENSE.md) file.
+
+However, since the data inside the `packages` directory is pulled from GitHub API, it is licensed under the under the terms of the CC-BY 4.0 open source license. See [GitHub documentation](https://docs.github.com/en/site-policy/github-terms/github-terms-for-additional-products-and-features#advisory-database) for the full terms.
+
+The shield logo is based on [this lovely icon by Saeful Muslim](https://thenounproject.com/icon/shield-1258213/), from The Noun Project. Used under a [Creative Commons BY 3.0](http://creativecommons.org/licenses/by/3.0/) license.