Add some docs for awssum-amazon

README.md

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+# Amazon (for AwsSum) #
+
+This is the base class for all Amazon services. It defines a few things such as constants and the constructor expects
+certain variables to be passed in, which are common across (most) services.
+
+It also defines two other base classes which include signing for AWS Signature v2 and AWS Signature v4. Your base class
+can inherit from these rather than the plain base class.
+
+## Writing an Amazon Service plugin for AwsSum ##
+
+There are many examples of service plugins for Amazon, so please take a look at the following repos:
+
+* https://github.com/awssum/awssum-amazon-s3 (custom signature)
+* https://github.com/awssum/awssum-amazon-ec2 (AWS Signature v2)
+* https://github.com/awssum/awssum-amazon-ses (custom signature)
+* https://github.com/awssum/awssum-amazon-dynamodb (AWS Signature v4)
+
+(Ends)