add requirements.txt file, add misc.py for storing ratelimit functions

requirements.txt

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+docopt~=0.6.2
+ratelimit~=2.2.1
+setuptools~=46.1.3

tumble/misc.py

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+"""
+misc.py
+Holds basic ratelimiting functionality to ensure ratelimits are never hit by the application.
+"""
+import ratelimit
+
+
+@ratelimit.sleep_and_retry
+@ratelimit.limits(calls=2, period=1)
+def pageQuery() -> None:
+    """
+    A blank function for ratelimiting page requests.
+    """
+    pass
+
+
+@ratelimit.sleep_and_retry
+@ratelimit.limits(calls=3, period=1)
+def mediaQuery() -> None:
+    """
+    A blank function for ratelimiting media requests.
+    """
+    pass