Add README

README.md

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+# pw - Password generator
+
+## Quick start
+
+### Build
+
+`make`
+
+### Install
+
+`sudo make install`
+
+(or, on OpenBSD):
+
+`doas gmake install`
+
+### Usage
+
+`pw`
+
+Generate password using default settings.
+
+## Documentation
+
+See the man page, when installed:
+
+`man pw`
+
+## Dependencies
+
+First build & install
+[libscnumerics](https://git.bobpolis.com/bob/libscnumerics).
+