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- Add official C source files, Makefile, c23-fallback.h, and LICENSE
- Update README.md with study mirror notice

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+# Modern C (C23 Edition) — Code & Study Mirror
+
+This repository contains the official code examples accompanying Jens Gustedt's *Modern C* (C23 Edition, Manning, 2024). I am currently studying this text, and custom build configurations, notes, or experimental branches may be added over time.
+
+---
+
+# Code examples for the book Modern C
+
+This is a collection of code snippets that come with the book
+
+  Jens Gustedt, /Modern C/, C23 edition, Manning, 2024
+
+They have probably not much value outside that context.
+
+The following files that come with this distribution have more
+information:
+
+    - Makefile, for hints about how to compile the code
+    - c23-fallback.h for the transition to C23
+    - LICENSE, for the specific license of this code
+
+You may find additional resources for the book at
+
+https://gustedt.gitlabpages.inria.fr/modern-c/
+
+If you cannot or do not want to purchase a copy of the book, you may
+obtain a CC licensed version of the C17 edition at
+
+https://hal.inria.fr/hal-02383654