chore: readme and release metadata

Cargo.toml

@@ -1,7 +1,18 @@
 [package]
 name = "substrate-crypto-light"
+description = "Cryptographic code for Substrate chains in pure rust with better baremetal support"
+license = "GPL-3.0-or-later"
 version = "0.1.0"
+authors = [
+    "Alexander Slesarev <[email protected]>",
+    "Vera Abramova <[email protected]>",
+]
+repository = "https://github.com/Alzymologist/substrate-crypto-light"
+homepage = "https://github.com/Alzymologist/substrate-crypto-light"
+documentation = "https://docs.rs/substrate-crypto-light"
+keywords = ["no_std", "crypto", "substrate", "polkadot"]
 edition = "2021"
+exclude = ["/for_tests", "/.github"]
 
 [dependencies]
 base58 = {version = "0.2.0"}
@@ -20,7 +31,7 @@ zeroize = {version = "1.7.0", features = ["derive"]}
 
 [dev-dependencies]
 hex = "0.4.3"
-mnemonic-external = {git = "https://github.com/Alzymologist/mnemonic-external"}
+mnemonic-external = "0.1.0"
 sp-core = "34.0.0"
 
 [features]

README.md

@@ -1,12 +1,13 @@
+Cryptographic code for Substrate chains in pure rust with better baremetal support.
+
 This is largely based on
-[`sp_core`](https://docs.rs/sp-core/latest/sp_core/) crate. Draft.
+[`sp_core`](https://docs.rs/sp-core/latest/sp_core/) crate.
 
 Key differences here:
 
 - no-std compatible with arm,
 - sr25519 supports external Rng, for usability on baremetal
-- ecdsa support based on pure Rust crate `k256` (TODO need to transfer stuff
-  here from Kampela code, as of now), to avoid compiling difficulties
+- ecdsa support based on pure Rust crate `k256`, to avoid compiling difficulties
   (original `sp-core` has ecdsa from `secp256k1` C wrapper crate and it does
   not compile on certain no-std targets and creates extremely large binary
   blob on others)