Updated challenges showing off dojo features

hello/apple/README.md

@@ -0,0 +1,10 @@
+# hello
+## apple
+
+This challenge is named `apple`, and is located within module `hello`.
+
+When users start this challenge, their environment will have:
+- `/flag`
+- `/challenge/apple`
+
+`/flag` is read-only by root, and `/challenge/apple` is setuid root.

hello/apple/apple

@@ -0,0 +1,4 @@
+#!/opt/pwn.college/python
+
+with open("/flag") as f:
+    print(f.read())