New Tool: Build a Flow SDK [Rust] - Milestone 2 (#60)

* Flow.rs Milestone 2

* Update with link to repo

submissions/issue-20/milestone-2/fee1-dead/20211010-milestone-2.md

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+# `flow-sdk` status update
+
+See [the flow.rs repository](https://github.com/fee1-dead/flow.rs).
+
+Instead of using `prost`, a new crate named `otopr` has been built from scratch.
+Since `otopr` does not yet have the capability to generate Rust sources from `.proto` files,
+entities are implemented by hand.
+
+User stories checklist:
+
+Blocks - See [`examples/blocks.rs`](https://github.com/fee1-dead/flow.rs/blob/master/examples/blocks.rs):
+- [x] retrieve a block by ID
+- [x] retrieve a block by height
+- [x] retrieve the latest block
+
+Collections - See [`examples/collections.rs`](https://github.com/fee1-dead/flow.rs/blob/master/examples/collections.rs):
+- [x] retrieve a collection by ID
+
+Events - See [`examples/events.rs`](https://github.com/fee1-dead/flow.rs/blob/master/examples/events.rs):
+- [x] retrieve events by name in the block height range
+
+Scripts:
+- [ ] submit a script and parse the response - Needs parsing
+- [ ] submit a script with arguments and parse the response - Needs parsing
+
+Accounts - See [`examples/accounts.rs`](https://github.com/fee1-dead/flow.rs/blob/master/examples/accounts.rs):
+- [x] retrieve an account by address
+- [ ] create a new account - A transaction with provided cadence template
+- [ ] deploy a new contract to the account - A transaction with provided cadence template
+- [ ] remove a contract from the account - A transaction with provided cadence template
+- [ ] update an existing contract on the account - A transaction with provided cadence template
+
+Transactions - See [`examples/transactions.rs`](https://github.com/fee1-dead/flow.rs/blob/master/examples/transactions.rs): 
+- [ ] retrieve a transaction by ID - Arguments of the transaction will eventually be parsed or used as plain text only
+- [x] sign a transaction (single payer, proposer, authorizer or combination of multiple)
+- [x] submit a signed transaction
+- [ ] sign a transaction with arguments and submit it - Requires Cryptography and Access API - Arguments need to be serialized as Cadence-JSON