feat: Add readme

Author: Chris-Holdt

README.md

@@ -0,0 +1,73 @@
+<img src="https://www.activeledger.io/wp-content/uploads/2018/09/Asset-23.png" alt="Activeledger" width="500"/>
+
+# Activeledger - PHP Key SDK
+
+The Activeledger PHP Key SDK has been built to provide an easy way to generate an ECC keypair that can be used to sign transactions to be 
+sent to the Activeledger network.
+
+### Activeledger
+
+[Visit Activeledger.io](https://activeledger.io/)
+
+[Read Activeledgers documentation](https://github.com/activeledger/activeledger)
+
+## Installation
+
+```
+$ composer require activeledger/php-key ~0.0.1
+$ composer install -o
+```
+
+## Usage
+
+The SDK currently supports the following functions:
+* Generate a new ECC keypair
+* Sign a string using the generated private key
+
+### Generate a new ECC keypair
+
+The generate method returns an array containing the public and private keys as HEX strings.
+
+```php
+<?php
+use Activeledger\ActiveECC;
+
+class MyCoolClass
+{
+    public function generateKeyPair(): array
+    {
+        $ecc = new ActiveECC();
+        $keyPair = $ecc->generate();
+
+        // Alternatively call generate as a static method
+        $keyPair = ActiveECC::generate();
+
+        return $keyPair;
+    }
+}
+```
+
+### Sign a string using a private key
+
+The sign method takes two parameters: the private key as a HEX string, and the data to be signed also as a string.
+
+```php
+<?php
+use Activeledger\ActiveECC;
+
+class MyCoolClass
+{
+    public function signString(string $privateKey, string $data)
+    {
+        $ecc = new ActiveECC();
+        $signature = $ecc->sign($privateKey, $string);
+        return $signature;
+    }
+}
+```
+
+## License
+
+---
+
+This project is licensed under the [MIT](https://github.com/activeledger/activeledger/blob/master/LICENSE) License

src/Signature/Signer.php

@@ -17,8 +17,6 @@ public function sign(string $privateKeyHex, string $data): string
     $sig = $this->signData($data, $key);
     $this->signature = $sig;
 
-    // $hexStr = '0x' . bin2hex($sig);
-
     return base64_encode($sig);
   }