README: added build information and copyright

README

@@ -17,6 +17,36 @@ purposes beyond its scope.
 
 See docs/ for more on the specific utilities currently implemented.
 
+Building
+
+The coreutils require minimal dependencies for building:
+
+- bindgen(1)
+- cc(1) with -idirafter
+- cp(1p)
+- make(1p)
+- mkdir(1p)
+- rustc(1) or equivalent
+- sh(1p)
+
+To build and install:
+
+$ make
+$ make PREFIX="/your/preferred/location" install
+
+To build with a different compiler than the default:
+
+$ make CC=clang # different C compiler than cc(1)
+$ make RUSTC=gccrs # different Rust compiler than rustc(1)
+
+To test the utilities:
+
+$ make test
+
+To remove all untracked files:
+
+$ make clean
+
 Read More
 
 An Introduction to the Unix Shell
@@ -30,3 +60,7 @@ Master Foo Discourses on the Unix-Nature
 
 Shell Programming!
 <https://tldp.org/LDP/abs/html/why-shell.html>
+
+--
+This work © 2023–2024 by Emma Tebibyte is licensed under CC BY-SA 4.0. To view a
+copy of this license, visit <http://creativecommons.org/licenses/by-sa/4.0/>