Update README.md

Author: vizeet

README.md

@@ -1,2 +1,22 @@
 # bitcoin_core_python_client
-Python to analyse bitcoin blockchain, chainstate, blockindex, mempool etc
+Contains many useful Programs to parse bitcoin blockchain
+
+## List of programs and their utility
+1. blockfile_parser.py : Bitcoin blockchain is stored by default under "~/.bitcoin/blocks". This program parses those blocks to print in json format content of those files.
+2. leveldb_parser.py: Bitcoin blockchain indexes are stored in leveldb databases. There are three databases
+   i. Path ~/.bitcoin/blocks/index : Block index to determine last block and its predecessors in reverse order
+   ii. Path ~/.bitcoin/chainstate : Metadata related unspent transaction outs
+   iii. Path ~/.bitcoin/indexes/txindex : Provides offset and block number to reach each transaction
+3. traverse_block_indexes.py : This program utilises bitcoin block index database stored under "~/.bitcoin/blocks/index/" to reverse traverse blockchain.
+4. random_number_generator.py: This is random number generator which utilizes sound, webcam frames and system random utility to generate high entropy random number.
+5. script_parser.py : Parses Bitcoin's reverse polish script
+6. pubkey_address.py : Contains utility methods for private key, public key and address
+7. mnemonic_code.py : Mnemonic code is a secret consisting of 12/15/18/24 words. The program generates mnemonic code from random number.
+8. bitcoin_networkapis.py : Uses blockchain.info APIs to get some useful information
+9. bitcoin_localapis.py : Uses bitcoin client RPC calls to implement useful methods
+
+## List of Jupyter Notebook documents
+1. BlockFileParser.ipynb : Contains information on structure of blockfile, blocks and transactions
+2. BitcoinRPCUtils.ipynb : Contains many utility methods such as target threshold, current block size, actual block reward etc
+3. BitcoinEllipticCurveCryptography.ipynb : Detailed information on Bitcoin elliptic curve cryptography
+4.