Add Changelog file (#97)

* changelog

* changelog

* changelog

CHANGELOG.md

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+# Aptos TypeScript SDK Changelog
+
+All notable changes to the Aptos TypeScript SDK will be captured in this file. This changelog is written by hand for now. It adheres to the format set out by [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## 0.0.0 (2023-10-18)
+
+- Fetch data from chain
+- Fund account with APT coins
+- Proper formatting and parsing of account addresses as defined by [AIP-40](https://github.com/aptos-foundation/AIPs/blob/main/aips/aip-40.md)
+- Submit transactions
+  - Single signer
+  - Fee payer
+  - Multi agent
+  - With payloads
+    - Entry function
+    - Script
+    - Multisig
+- Simulate a transaction
+  - Single signer
+  - Fee payer
+  - Multi agent
+- Built in transaction generation
+  - Transfer coins
+  - Mint collection
+  - Mint nft
+- Keys management
+  - ED25519
+  - Secp256k1 - to go in next devnet release
+  - Generate new keys
+  - Derive from existing private key
+  - Derive from mnemonics path
+  - Derive from private key and address (for account that has it's key rotated)
+  - Sign
+  - Verify signature
+- BCS support
+  - Move sub-classes to easily serialize and deserialize Move types
+  - Unified Argument class for entry function and script payload argument types
+  - Full nested serialization/deserialization support
+- Examples (both typescript and javascript)
+  - Simple transfer transaction example
+  - Transfer transaction example using built in transferCoinTransaction
+  - Fee payer (aka sponsored) transaction example
+  - Multi agent transaction example
+  - Mint collection and nft
+- Local custom types (instead of generating types)
+- In depths type checking on compile time
+  - Typescript can infer the return type based on the argument being passed into `generateTransaction` function (singlesigner,multiagent,feepayer)
+  - Support for orderBy keys type checking for indexer queries