intcmp(1): new tool; npc(1): new tool; scrut(1): new tool; str(1): new tool; strcmp(1): new tool; tests: added POSIX compatibility test and C compiler compatibility test; Makefile: converted to GNUmakefile; README: added README; docs: added docs

docs/true.1

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+.\" Copyright (c) 2022 DTB <trinity@trinity.moe>
+.\" Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
+.\"
+.\" This work is licensed under CC BY-SA 4.0. To see a copy of this license,
+.\" visit <http://creativecommons.org/licenses/by-sa/4.0/>.
+
+.TH TRUE 1
+
+.SH NAME
+
+true \(en do nothing, successfully
+
+.SH DESCRIPTION
+
+True does nothing regardless of operands or standard input.
+True will always return an exit code of 0.
+
+.SH RATIONALE
+
+True exists for the construction of control flow and loops based on a success.
+
+True functions as described in POSIX.1-2017.
+
+.SH AUTHOR
+
+Written by Emma Tebibyte <emma@tebibyte.media>.
+
+.SH COPYRIGHT
+
+This work is marked with CC0 1.0. To see a copy of this license, visit
+<http://creativecommons.org/publicdomain/zero/1.0>.
+
+.SH SEE ALSO
+
+false(1)