[WIP] add some README.md for each packages

packages/harmony-account/README.md

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+# Plan
+
+1. Account instance
+2. Create Account
+3. Import prv key
+4. Import/Export keystore file
+5. BIP39
+6. BIP44
+7. Sign txn/message
+8. getBalance
+9. Wallet CRUD

packages/harmony-crypto/README.md

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+# Plan
+
+1. ECDSA
+2. Random bytes
+3. AES/DES for web3
+4. DRBG(?)
+5. keyTools 

packages/harmony-network/README.md

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+# Plan
+1. RPC methods
+2. Request and Response type def.
+3. Middleware for provider
+4. Base Provider

packages/harmony-utils/README.md

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+# Plan
+
+1. validators
+2. transformers
+3. common tools