Merge pull request 'Add README.md' (#2) from fix/add-readme into main

Reviewed-on: #2

README.md

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+# libscterm — Terminal utilities and I/O-manipulators for ANSI escapes
+
+C++ library with terminal utilities and I/O-manipulators for ANSI escapes. Full
+support for NO_COLOR environment variable.
+
+## Build
+
+`make`
+
+after installing dependency:
+
+- [libscerror](https://git.bobpolis.com/bob/libscerror/)
+
+## Install
+
+`sudo make install`
+
+or, on OpenBSD:
+
+`doas gmake install`
+
+## Documentation
+
+In progress. For now, please consult the library header at
+`/usr/local/include/libscerror.hpp`, after successful installation.