fix license & readme

LICENSE.txt

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+MIT License
+
+Copyright (c) 2023 Temnij
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+[![NuGet](https://img.shields.io/nuget/v/NBip32Fast.svg)](https://www.nuget.org/packages/NBip32Fast)
+[![NuGet](https://img.shields.io/nuget/v/NBip32Fast.Secp256K1.svg)](https://www.nuget.org/packages/NBip32Fast.Secp256K1)
+[![NuGet](https://img.shields.io/nuget/v/NBip32Fast.Ed25519.svg)](https://www.nuget.org/packages/NBip32Fast.Ed25519)
+[![NuGet](https://img.shields.io/nuget/v/NBip32Fast.NistP256.svg)](https://www.nuget.org/packages/NBip32Fast.NistP256)
+
+# NBip32Fast
+*High perfomance BIP-32 HD key derivation library for .NET 8*
+
+## Usage
+### Basic
+```cs
+var secp256k1Key = Secp256K1.Secp256K1HdKey.Instance.DerivePath("m/44'/0'/0'/0/0", seed).Key;
+var nistP256Key = NistP256.NistP256HdKey.Instance.DerivePath("m/44'/0'/0'/0/0", seed).Key;
+var ed25519Key = Ed25519.Ed25519HdKey.Instance.DerivePath("m/44'/0'/0'/0'/0'", seed).Key;
+```
+
+### Optimised
+```cs
+var master = Ed25519.Ed25519HdKey.Instance.DerivePath("m/44'/888'/0'/0'", seed);
+var accounts = new List<byte[]>();
+
+for (var i = 0u; i < 5u; i++)
+{
+    accounts.Add(Ed25519.Ed25519HdKey.Instance.GetPublic(Ed25519.Ed25519HdKey.Instance.Derive(master, new KeyPathElement(i, true)).Key));
+}
+```
+
+## Benchmarks
+> Intel Core i9-14900K, 1 CPU, 32 logical and 24 physical cores
+
+### SecP256K1
+| Method        | Mean      | Error    | StdDev   |
+|-------------- |----------:|---------:|---------:|
+| **NBip39FastKey** |  38.10 us | 0.329 us | 0.308 us |
+| NBitcoinKey   | 454.49 us | 0.789 us | 0.700 us |
+| NetezosKey    | 647.82 us | 4.799 us | 4.254 us |
+
+### Ed25519
+| Method        | Mean     | Error     | StdDev    |
+|-------------- |---------:|----------:|----------:|
+| **NBip32FastKey** | 4.561 us | 0.0242 us | 0.0227 us |
+| NetezosKey    | 5.962 us | 0.0300 us | 0.0281 us |
+| P3HdKey       | 6.264 us | 0.1115 us | 0.1489 us |
+
+### NistP256
+| Method        | Mean       | Error   | StdDev  |
+|-------------- |-----------:|--------:|--------:|
+| **NBip39FastKey** |   163.8 us | 0.26 us | 0.32 us |
+| NetezosKey    | 1,447.5 us | 5.16 us | 4.57 us |
+
+[Benchmark code](https://github.com/kzorin52/NBip32Fast/blob/master/NBip32Fast.Benchmark/Program.cs)