added config files

Author: rongxin-liu

project/.cs50.yml

@@ -0,0 +1,9 @@
+submit50:
+  files: &submit50_files
+    - !require README.md
+  style: false
+
+check50:
+  files: *submit50_files
+
+  

project/__init__.py

@@ -0,0 +1,19 @@
+import re
+import check50
+
+@check50.check()
+def exists():
+    """README.md exists"""
+    check50.exists("README.md")
+
+@check50.check(exists)
+def final():
+    """final project details"""
+    text = open("README.md").read().lower()
+    if len(text) < 2500:
+        raise check50.Failure(f"Description is not long enough.")
+       
+    urls = re.findall('https?:\/\/[\w/\-?=%.]+\.[\w/\-?=%.]+', text)
+    if not urls:
+        raise check50.Failure(f"Video URL is missing.")
+