Add README for corpus_builder app

LICENSES/MIT.txt

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+MIT License
+
+Copyright (c) 2024 Sascha Brawer
+
+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.

corpus_builder/README.md

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+# Corpus Builder
+
+![Screenshot](./screenshot.png)
+
+Corpus Builder is an ad-hoc desktop application that was written to
+help building the Cadasym image corpus. When the application starts
+up, it asks for PDFs with scanned cadastral mutation plans.  After
+converting them to pixmaps, basic Computer Vision algorithms (from the
+OpenCV library) are used to find potential cadastral symbols.  The
+symbol candidates are presented to the user, who manually classifies
+each symbol to build up the image corpus. After a candidate has been
+classificed, the corpus builder app stores a cropped 256×256 pixel image
+into the `corpus` folder.
+
+
+## Setup
+
+```sh
+git clone https://github.com/brawer/cadasym.git
+cd cadasym
+python3 -m venv venv
+venv/bin/pip3 install -r requirements.txt
+venv/bin/python3 -m corpus_builder
+```
+
+## License
+
+The source code to this app is eleased under the
+[../LICENSES/MIT.txt](MIT license).
+
+