docs for create-attributes, created the intro and the CreateStringAtt…

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docs/examples/Database/create-attribute.md

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+Usage of CreateAttribute methods
+
+Attributes that are available:
+- string
+- Enum
+- Email
+- Ip
+- Url
+- Integer
+- Float
+- Boolean
+
+Note: for the optional parameters, there is new type created (since GO doesn't have optional or default arguments). The Optional type is defined as a struct with fields:
+
+- Value -> this contains the value
+- Specified -> wether or not it is specified (defaults to false)
+
+Optional[T]{} -> replace T with the desired type (string, int, ...)
+empty optional = will see as "optional value not set"
+
+Example Use of the CreateAttribute functions:
+
+CreateStringAttribute("unique()", "StringName", 15, false, Optional[string]{Value: "MyDefaultString",Specified: false}, Optional[bool]{}) 
+This wil create a String attribute with name "StringName" that is max. 15 characters long and has default value "MyDefaultString". Since the isArray is an empty Optional[bool], the isArray bool will be false -> this is not an array