Move testing information to dedicated file

Author: zachborboa

README.md

@@ -18,7 +18,7 @@ PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs.
 - [Available Methods](#available-methods)
 - [Security](#security)
 - [Troubleshooting](#troubleshooting)
-- [Run Tests](#run-tests)
+- [Testing](#testing)
 - [Contribute](#contribute)
 
 ---
@@ -373,27 +373,9 @@ See [SECURITY](https://github.com/php-curl-class/php-curl-class/blob/master/SECU
 
 See [TROUBLESHOOTING](https://github.com/php-curl-class/php-curl-class/blob/master/TROUBLESHOOTING.md) for troubleshooting.
 
-### Run Tests
+### Testing
 
-To run tests:
-
-    $ git clone https://github.com/php-curl-class/php-curl-class.git
-    $ cd php-curl-class/
-    $ composer update
-    $ ./tests/run.sh
-
-To run select tests:
-
-    $ git clone https://github.com/php-curl-class/php-curl-class.git
-    $ cd php-curl-class/
-    $ composer update
-    $ ./tests/run.sh --filter=keyword
-
-To test all PHP versions in containers:
-
-    $ git clone https://github.com/php-curl-class/php-curl-class.git
-    $ cd php-curl-class/
-    $ ./tests/test_all.sh
+See [TESTING](https://github.com/php-curl-class/php-curl-class/blob/master/TESTING.md) for testing information.
 
 ### Contribute
 

TESTING.md

@@ -0,0 +1,23 @@
+# Testing
+
+### Run Tests
+
+To run tests:
+
+    $ git clone https://github.com/php-curl-class/php-curl-class.git
+    $ cd php-curl-class/
+    $ composer update
+    $ ./tests/run.sh
+
+To run select tests:
+
+    $ git clone https://github.com/php-curl-class/php-curl-class.git
+    $ cd php-curl-class/
+    $ composer update
+    $ ./tests/run.sh --filter=keyword
+
+To test all PHP versions in containers:
+
+    $ git clone https://github.com/php-curl-class/php-curl-class.git
+    $ cd php-curl-class/
+    $ ./tests/test_all.sh