Merge pull request 'Add README.md' (#3) from fix/add-readme into main

Reviewed-on: #3

README.md

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+# progress — Demo tool for the libscterm library
+
+Simple tool, meant to be built and run (not installed).
+
+## Build
+
+`make`
+
+after installing dependencies:
+
+- [libscterm](https://git.bobpolis.com/bob/libscterm/)
+- [libscgui](https://git.bobpolis.com/bob/libscgui/) NOT YET AVAILABLE
+
+## Run
+
+`./progress`
+