Add copyrights.

README.md

@@ -31,3 +31,9 @@ changes with each release. Expect a stable release sometime in 2024.
 * [Argument Processing](./doc/arg-processor.md)
 * [Developer Guide](./doc/developer-guide.md)
 * [User Guide](./doc/user-guide.md)
+
+- - - - - - - - - -
+```
+Copyright 2022-2024 the Bashy-lib Authors (Dan Bornstein et alia).
+SPDX-License-Identifier: Apache-2.0
+```

doc/arg-processor.md

@@ -131,3 +131,9 @@ value.
 
 Adds a post-processing call which fails if there is not exactly one of the
 given named arguments present in the arguments passed to `process-args`.
+
+- - - - - - - - - -
+```
+Copyright 2022-2024 the Bashy-lib Authors (Dan Bornstein et alia).
+SPDX-License-Identifier: Apache-2.0
+```

doc/developer-guide.md

@@ -146,3 +146,9 @@ $ echo 'my-subproject/scripts' > scripts/lib/my-subproject.link
 
 With that, you can now say `ubik my-subproject ...` or (in scripts) `lib
 my-subproject ...`.
+
+- - - - - - - - - -
+```
+Copyright 2022-2024 the Bashy-lib Authors (Dan Bornstein et alia).
+SPDX-License-Identifier: Apache-2.0
+```

doc/user-guide.md

@@ -53,3 +53,9 @@ contents directly (it is self-contained).
 searches up the directory hierarchy from the CWD for an `ubik` script to run (in
 a `bin` or `scripts` directory), and if it finds one it will run it with
 whatever arguments you passed to the function.
+
+- - - - - - - - - -
+```
+Copyright 2022-2024 the Bashy-lib Authors (Dan Bornstein et alia).
+SPDX-License-Identifier: Apache-2.0
+```