2025 day 9 part 2 in TS

2025/day09/README.md

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+# Day 9: Typescript
+
+Lost a lot of time on a swapped argument order. Oh well, such is life. The `package.json` exists to
+instruct the interpreter on how to execute the file and doesn't otherwise include any meaningful
+dependencies. Everything works with the standard library for Node.
+
+`ts-node` is used for just-in-time Typescript compilation. You can also compile the file manually
+first, then run it as JS. Also, Oracle, please release the name Javascript.
+
+```console
+$ ./solve.ts sample.txt
+Part 1: 50
+Part 2: 24
+```