Update readme, add recent screenshots

README.rst

@@ -10,24 +10,26 @@ Blocksmurfer
 .. image:: https://coveralls.io/repos/github/1200wd/blocksmurfer/badge.svg?branch=master
     :target: https://coveralls.io/github/1200wd/blocksmurfer?branch=master    
 
-Install and run a local block explorer.
+Install and run a local Bitcoin block explorer.
 
 Bitcoin blockchain explorer based on Python Bitcoinlib (https://github.com/1200wd/bitcoinlib).
 Search the blockchain for addresses, transactions, blocks, unspent outputs, etc.
 
+Decompose and analyse complex Bitcoin transactions, scripts, signatures and keys.
+
 This software currently runs on https://blocksmurfer.io
 
 Data will be retrieved from various service providers such as Blockchair, Blockchain.info or Blockstream.
 Blocksmurfer can also receive data from a local bcoin or bitcoind server.
 
 .. image:: https://blocksmurfer.io/static/images/blocksmurfer_transaction.png
-    :alt: Run a bitcoin block explorer locally
+    :alt: Look into transaction details, transaction inputs and outputs
 
 .. image:: https://blocksmurfer.io/static/images/blocksmurfer_block.png
-    :alt: Run a bitcoin block explorer locally
+    :alt: Analyse blocks - Run a bitcoin block explorer locally
 
 .. image:: https://blocksmurfer.io/static/images/blocksmurfer_script.png
-    :alt: Run a bitcoin block explorer locally
+    :alt: Decompose complex bitcoin scripts, analyse keys, signatures and witness data
 
 
 Installation