Update README.md

README.md

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-# url_lookup_service
+# Url Lookup Service
+
+Url Lookup Service provides web site secure level for requested url. A client wants to know whether a certain web site contains a malware or abuse such as adult, games, fraud, etc. How to work is that a client passes full uri then this url lookup service returns the safe level in JSON.
+
+## Considerations
+* The size of the URL list could grow infinitely, how you might scale this beyond the memory capacity of the system.
+* The number of requests may exceed the capacity of this system, how you might solve that.
+* What strategies you might use to update the service with new URLs. Updates may be as much as 5 thousand URLs a day with updates arriving every 10 minutes.
+
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+