Update readme, add badges (#105)

* fix README, add badges for ergo-lib;

* add badges to ergo-lib-wasm readme;

README.md

@@ -4,9 +4,9 @@
 Rust implementation of [ErgoScript](https://github.com/ScorexFoundation/sigmastate-interpreter) cryptocurrency scripting language. 
 
 ## Crates
-[ergo-lib](https://github.com/ergoplatform/sigma-rust/tree/develop/ergo-lib) - ErgoTree, interpreter, chain types (transactions, boxes, etc.), JSON serialization.
+[ergo-lib](https://github.com/ergoplatform/sigma-rust/tree/develop/ergo-lib) - ErgoTree, interpreter, chain types (transactions, boxes, etc.), JSON serialization, tx creation and signing.
 
-[ergo-wallet](https://github.com/ergoplatform/sigma-rust/tree/develop/ergo-lib) - Transaction creation and signing. Has bindings for the following platforms:
+Has bindings for the following platforms:
 - [JS/TS(WASM)](https://github.com/ergoplatform/sigma-rust/tree/develop/bindings/ergo-lib-wasm)
 - [iOS](https://github.com/ergoplatform/sigma-rust/tree/develop/bindings/ergo-lib-ios)
 - [Android(JNI)](https://github.com/ergoplatform/sigma-rust/tree/develop/bindings/ergo-lib-android)

bindings/ergo-lib-wasm/README.md

@@ -1,2 +1,6 @@
+[![Latest Version](https://img.shields.io/crates/v/ergo-lib-wasm.svg)](https://crates.io/crates/ergo-lib-wasm)
+[![Documentation](https://docs.rs/ergo-lib-wasm/badge.svg)](https://docs.rs/crate/ergo-lib-wasm)
+
+
 WebAssembly library with JS/TS bindings for [sigma-rust](https://github.com/ergoplatform/sigma-rust).
 

ergo-lib/README.md

@@ -1,8 +1,12 @@
+[![Latest Version](https://img.shields.io/crates/v/ergo-lib.svg)](https://crates.io/crates/ergo-lib)
+[![Documentation](https://docs.rs/ergo-lib/badge.svg)](https://docs.rs/crate/ergo-lib)
+
 Features:
 - ErgoTree AST;
-- interpreter;
-- chain types (transactions, boxes, etc.);
-- JSON serialization.
+- Interpreter;
+- Transactions, boxes, etc.;
+- JSON serialization;
+- Transaction creation and signing;
 
 # Usage
 ## Crate features