phpunit test update, update all static testers, add psalm tester

Add Readme file update for install via composer

psalm static checker added
phan and phpstan update with ignoring vendor and test files as they are
not needed in final system

psalm.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<psalm
+    errorLevel="3"
+    resolveFromConfigFile="true"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="https://getpsalm.org/schema/config"
+    xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+>
+    <projectFiles>
+        <directory name="src" />
+        <ignoreFiles>
+            <directory name="vendor" />
+            <directory name="test" />
+        </ignoreFiles>
+    </projectFiles>
+</psalm>