add Max README (#220)

src/Max/README.md

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+# Max
+
+```haskell
+Max Number
+```
+
+`Max` is a `Monoid` that will combines (2) `Number`s, resulting in the largest
+of the two.
+
+```javascript
+const Max = require('crocks/Max')
+const mconcat = require('crocks/helpers/mconcat')
+
+Max(76)
+//=> Max 76
+
+mconcat(Max, [ 95, 102, 56 ])
+//=> Max 102
+
+Max(100)
+  .concat(Max(10))
+//=> Max 100
+
+Max.empty()
+  .concat(Max(100))
+//=> Max 100
+```
+
+## Implements
+
+`Semigroup`, `Monoid`
+
+## Constructor Methods
+
+#### empty
+
+```haskell
+Max.empty :: () -> Max
+```
+
+`empty` provides the identity for the `Monoid` in that when the value it
+provides is `concat`ed to any other value, it will return the other value. In
+the case of `Max` the result of `empty` is `-Infinity`. `empty` is available on
+both the Constructor and the Instance for convenience.
+
+```javascript
+const Max = require('crocks/Max')
+
+Max.empty()
+//=> Max -Infinity
+
+Max.empty()
+  .concat(Max.empty())
+//=> Max -Infinity
+
+Max(32)
+  .concat(Max.empty())
+//=> Max 32
+
+Max.empty()
+  .concat(Max(34))
+//=> Max 34
+```
+
+## Instance Methods
+
+#### concat
+
+```haskell
+Max ~> Max -> Max
+```
+
+`concat` is used to combine (2) `Semigroup`s of the same type under an
+operation specified by the `Semigroup`. In the case of `Max`, it will result
+in the largest of the (2) `Number`s.
+
+```javascript
+const Max = require('crocks/Max')
+
+Max(23)
+  .concat(Max(13))
+//=> Max 23
+
+Max(-23)
+  .concat(Max(-32))
+//=> Max -23
+
+Max.empty()
+  .concat(Max(Infinity))
+//=> Max Infinity
+```
+
+#### valueOf
+
+```haskell
+Max ~> () -> Number
+```
+
+`valueOf` is used on all `crocks` `Monoid`s as a means of extraction. While the
+extraction is available, types that implement `valueOf` are not necessarily a
+`Comonad`. This function is used primarily for convenience for some of the
+helper functions that ship with `crocks`. Calling `valueOf` on a `Max` instance
+will result in the underlying `Number`.
+
+```javascript
+const Max = require('crocks/Max')
+
+Max(4)
+  .valueOf()
+//=> 4
+
+Max.empty()
+  .valueOf()
+//=> -Infinity
+
+Max(34)
+  .concat(Max(21))
+  .valueOf()
+//=> 34
+```