Add README

Signed-off-by: Benedikt Spranger <[email protected]>

README.md

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+<!-- SPDX-FileCopyrightText: 2023 Linutronix GmbH <[email protected]> -->
+<!-- SPDX-License-Identifier: CERN-OHL-S-2.0 -->
+
+[![KiCad CI/CD for baggerdails RPi HAT](https://github.com/linutronix/baggerdails/actions/workflows/main.yml/badge.svg)](https://github.com/linutronix/baggerdails/actions/workflows/main.yml)
+![baggerdails logo](https://github.com/linutronix/baggerdails/raw/master/images/logo.png "baggerdails logo")
+
+# baggerdails - A RPi HAT for a trade fair demo
+
+The baggerdails RPi HAT is a small PCB containing 14 LEDs, a 256k serial
+EEPROM, an ATECC608 Security Verification / Encryption IC, two SPI display
+connectors and last but not least an USB serial converter attached to a
+full-size 40W GPIO connector as described in the
+[ADD-ON BOARDS AND HATs specification](https://github.com/raspberrypi/hats).
+
+## License rules
+
+baggerdails is provided under the terms of the CERN-OHL-S license version 2
+as provided in the LICENSES/CERN-OHL-S-2.0 file.
+
+Instead of adding license boilerplates to the individual files, baggerdails
+uses SPDX license identifiers, which are machine parseable and considered
+legaly equivalent.
+
+The SPDX license identifier in baggerdails shall be added at the first possible
+line in a file which can contain a comment. This is normally the first line
+except for scripts. Scripts require the #!PATH_TO_INTERPRETER tag in the
+first line; place the SPDX identifier into the second line.
+
+The SPDX license identifier is added in form of a comment.
+
+## Copyright and License
+
+Copyright Linutronix GmbH 2023.
+
+This source describes Open Hardware and is licensed under the CERN-OHL-S v2.
+You may redistribute and modify this source and make products using it
+under the terms of the CERN-OHL-S v2 (https://ohwr.org/cern_ohl_s_v2.txt).
+
+This source is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY,
+INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A
+PARTICULAR PURPOSE.
+
+Please see the CERN-OHL-S v2 for applicable conditions.
+
+Source location: https://github.com/linutronix/baggerdails
+
+As per CERN-OHL-S v2 section 4, should You produce hardware based
+on this source, You must where practicable maintain the Source Location
+visible on the external case of the baggerdails or other products you make
+using this source.