Add injection1.

injection1/description.md

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+I need help logging into this [website](https://injection1.web.easyctf.com) to get my flag! If it helps, my username is `admin`.

injection1/grader.py

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+def grade(autogen, key):
+    if key.find("a_prepared_statement_a_day_keeps_the_d0ctor_away!") != -1:
+        return True, "You got it!"
+    return False, "Nope. Keep poking around."

injection1/problem.yml

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+author: mzhang
+title: SQL Injection 1
+hint: What does "injection" mean? How can you "inject" code into your username to control the username lookup?
+category: Web
+autogen: false
+programming: false
+value: 100