Documentation (#12)

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* Create Transforms.md

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* Create Lambdas.md

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documentation/Lambdas.md

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+### Lambda Implementation
+
+The library doesn't provide a lambda implementation but it does provide something akin to the lambda feature. 
+
+Add a `HBMustacheLambda` to the object you want to be rendered and it can be used in a similar way to lambdas are used in Mustache. When you create a section referencing the lambda the contents of the section are passed as a template along with the current object to the lamdba function. This is slightly different from the standard implementation where the unprocessed text is passed to the lambda. 
+
+Given the object `person` defined below
+```swift
+struct Person {
+    let name: String
+    let wrapped: HBMustacheLambda
+}
+let person = Person(
+    name: "John", 
+    wrapped: HBMustacheLambda { object, template in
+        return "<b>\(template.render(object))</b>"
+    }
+)
+
+```
+and the following mustache template  
+```swift
+let mustache = "{{#wrapped}}{{name}} is awesome.{{/wrapped}}"
+let template = try HBMustacheTemplate(string: mustache)
+```
+Then `template.render(person)` will output 
+```
+<b>John is awesome.</b>
+```
+In this example the template constructed from the contents of the `wrapped` section of the mustache is passed to my `wrapped` function inside the `Person` type.