Add proper README (#35)

Author: asifmallik

README.md

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+# Sniffpy
+
+Sniffpy is a python implementation of [MIME Sniffing Standard](https://mimesniff.specw.whatwg.org/)
+MIME sniffing describes algorithms that attempt to discern the correct MIME type of some given
+data. The MIME type of a file or byte stream describes its format. For example, the MIME type of an image could be
+`image/jpeg` or `image/png` depending on its exact format. MIME types consist of:
+
+* the `type` which describesthe broad category of the data
+* the `subtype` which describes the exact kind of data
+* an optional `parameter` which gives further information about the data
+
+The exact specification of MIME types can be found [here](https://tools.ietf.org/html/rfc6838)
+
+## Example
+
+The following is an example on how to use sniffpy to guess the MIME type of an HTTP response using requests
+
+```
+import requests
+
+r = requests.get("https://httpbin.org/image/jpeg")
+mime_type = sniffpy.sniff(r.content) #returns a MIMEType object
+
+print(mime_type.type) #prints "image"
+print(mime_type.subtype) #prints "jpeg"
+
+print(mime_type) #prints "image/jpeg"
+```
+
+Documentation on how to use the package and how to contribute can be found on [here](https://sniffpy.readthedocs.io/en/latest/)

README.rst

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+import sniffpy
+import requests
+
+r = requests.get("https://httpbin.org/image/jpeg")
+mime_type = sniffpy.sniff(r.content) #returns a MIMEType object
+
+print(mime_type.type) #prints "image"
+print(mime_type.subtype) #prints "jpeg"
+
+print(mime_type) #prints "image/jpeg"