Add license information. (#372)

LICENSE

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+The documentation (text in the docs folder) is licensed under CC Attribution 4.0 International (CC BY 4.0) [1].
+See LICENSE_CC4.
+
+Code samples inside the documentation are licensed under BSD0 [2].
+See LICENSE_BSD0.
+
+Code that is used to serve the documentation (React code in src, ...) is licensed under LGPL 2.1 [3].
+See LICENSE_LGPL.
+
+[1] https://creativecommons.org/licenses/by/4.0/
+[2] https://spdx.org/licenses/BSD-0-Clause.html
+[3] https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html

LICENSE_BSD0

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+Zero-Clause BSD License
+
+Copyright (C) 2022 Toitware ApS
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.

docs/LICENSE

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+The documentation (text in this 'docs' folder) is licensed under CC Attribution 4.0 International (CC BY 4.0) [1].
+See LICENSE_CC4.
+
+Code samples inside the documentation are licensed under BSD0 [2].
+See LICENSE_BSD0.
+
+[1] https://creativecommons.org/licenses/by/4.0/
+[2] https://spdx.org/licenses/BSD-0-Clause.html

docs/LICENSE_BSD0

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+Zero-Clause BSD License
+
+Copyright (C) 2021 Toitware Aps
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.