seed: curriculum content

1.solar-system/1.welcome/02.hello-world/index.md

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+---
+type: challenge
+title: "Hello, World"
+xp: 25
+duration: 15
+difficulty: 1
+---
+
+# Hello, World
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, first signal. Write a script that creates `hello.txt`
+> containing exactly:
+>
+> ```
+> Hello, World
+> ```
+>
+> Two commands:
+>
+> - `echo` prints text
+> - `>` redirects what would print into a file
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+In `starter/starter.sh`, write the command(s) that create `hello.txt`
+with the content `Hello, World`.
+
+## Objectives
+
+- `hello.txt` exists in the working directory
+- File contents match `Hello, World` exactly