add "How to program a text adventure in C"

Author: AfterRace

README.md

@@ -104,6 +104,29 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
   - [Part 6: Input and output](https://briancallahan.net/blog/20210819.html)
   - [Part 7: Arrays](https://briancallahan.net/blog/20210822.html)
   - [Part 8: Strings, forward references, and conclusion](https://briancallahan.net/blog/20210826.html)
+- How to program a text adventure in C
+  - [Part 1: Introduction](https://helderman.github.io/htpataic/htpataic01.html)
+  - [Part 2: The main loop](https://helderman.github.io/htpataic/htpataic02.html)
+  - [Part 3:Locations](https://helderman.github.io/htpataic/htpataic03.html)
+  - [Part 4:Objects](https://helderman.github.io/htpataic/htpataic04.html)
+  - [Part 5:Inventory](https://helderman.github.io/htpataic/htpataic05.html)
+  - [Part 6:Passages](https://helderman.github.io/htpataic/htpataic06.html)
+  - [Part 7:Distance](https://helderman.github.io/htpataic/htpataic07.html)
+  - [Part 8:North, east, south, west](https://helderman.github.io/htpataic/htpataic08.html)
+  - [Part 9:Code generation](https://helderman.github.io/htpataic/htpataic09.html)
+  - [Part 10: More attributes](https://helderman.github.io/htpataic/htpataic10.html)
+  - [Part 11: Conditions](https://helderman.github.io/htpataic/htpataic11.html)
+  - [Part 12: Open and close](https://helderman.github.io/htpataic/htpataic12.html)
+  - [Part 13: The parser](https://helderman.github.io/htpataic/htpataic13.html)
+  - [Part 14: Multiple nouns](https://helderman.github.io/htpataic/htpataic14.html)
+  - [Part 15: Light and dark](https://helderman.github.io/htpataic/htpataic15.html)
+  - [Part 16: Savegame](https://helderman.github.io/htpataic/htpataic16.html)
+  - [Part 17: Test automation](https://helderman.github.io/htpataic/htpataic17.html)
+  - [Part 18: Abbreviations](https://helderman.github.io/htpataic/htpataic18.html)
+  - [Part 19: Conversations](https://helderman.github.io/htpataic/htpataic19.html)
+  - [Part 20: Combat](https://helderman.github.io/htpataic/htpataic20.html)
+  - [Part 21: Multi-player](https://helderman.github.io/htpataic/htpataic21.html)
+  - [Part 22: Client-server](https://helderman.github.io/htpataic/htpataic22.html)
 
 ### Network programming