Basic used Exception documentation

What PHP Exception is used for what

NOTE: Subject to change

README.Exceptions.md

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+# Exception rules
+
+What exceptions to use for what
+
+NOTE: There will be custom Excpetions creaed and so some rules will change
+
+NOTE: For catching: always catch \Exception at the end to avoid missing some changed exceptions
+
+NOTE: Changed exceptions will have marked as critical API change
+
+## \Exception
+
+if there is nothing else matching, use this one
+
+## \InvalidArgumentException
+
+if argument to a function is not expected type
+
+## \UnexpectedValueException
+
+If the value is not matching to what we expect
+
+## \LengthException
+
+Given value is out of range
+
+## \RuntimeException
+
+Missing php modules or external programs
+
+## \OutOfRangeException
+
+Not in range of given expression (array or other)
+
+## Below are ERRORs
+
+### \ArgumentCountError [ERROR]
+
+If we have dynamic argument methods and we are missing a certain arguemnt count
+
+### \TypeError
+
+Invalid type