Added issue 20 - milestone 4 - nduplessis (#101)

submissions/issue-20/milestone-4/nduplessis/milestone-4.md

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+## New Tool: Build a Flow SDK - Milestone 4
+
+## Description
+
+This PR is for issue #20.
+
+This version of the Ruby SDK provides gRPC communication and a number of the SDK user stories, including script execution and single sig transaction signing and sending.
+
+Usage documentation is available at https://github.com/glucode/flow_client
+
+## Milestone 4
+
+All user stories from the SDK guidelines have been completed and tests have been added that execute against the emulator.
+
+Usages documentation can be found at https://github.com/glucode/flow_client
+
+### Features
+
+Blocks:
+- [x] retrieve a block by ID
+- [x] retrieve a block by height
+- [x] retrieve the latest block
+
+Collections:
+- [x] retrieve a collection by ID 
+
+Events:
+- [x] retrieve events by name in the block height range
+
+Scripts:
+- [x] submit a script and parse the response
+- [x] submit a script with arguments
+- [x] create a script that returns complex structure and parse the response
+
+Accounts:
+- [x] retrieve an account by address
+- [x] create a new account
+- [x] deploy a new contract to the account
+- [x] remove a contract from the account
+- [x] update an existing contract on the account
+
+Transactions: 
+- [x] retrieve a transaction by ID
+- [x] sign a transaction with same payer, proposer and authorizer
+- [x] sign a transaction with different payer and proposer
+- [x] sign a transaction with different authorizers using sign method multiple times
+- [x] submit a signed transaction
+- [x] sign a transaction with arguments and submit it