Created Function Filters (markdown)

Function-Filters.md

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+## Overview
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+Function Filters are a way for you to customize the WebJobs execution pipeline with your own logic. Filters are very similar in spirit to [ASP.NET Filters](https://docs.microsoft.com/en-us/aspnet/core/mvc/controllers/filters). They can be implemented as declarative attributes that can be applied to your job functions/classes.
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