Add model with attributes (#10)

* Add model with attributes

* Add Infinity and NaN

* Infinity and NaN in README

models/attributes/README.md

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+- Roblox Studio Version: 0.467.0.418297
+
+A folder with the following attributes:
+- Boolean: `true`
+- BrickColor: `Really red`
+- Color3: `rgb(162, 0, 255)`
+- ColorSequence: A color sequence with `#f00` at 0, `#0f0` at 0.5, and `#00f` at 1
+- Number: `12345`
+- NumberRange: `5, 10`
+- NumberSequence: A number sequence with the value 1 at the time 0, the value 0 at the time 0.5, and the value 1 at the time 1.
+- Rect: `1, 2, 3, 4`
+- String: `Hello, world!`
+- UDim: `0.5, 100`
+- UDim2: `{0.5, 10}, {0.7, 30}`
+- Vector2: `10, 50`
+- Vector3: `1, 2, 3`
+- Infinity: `math.huge`
+- NaN: `0/0`

models/attributes/xml.rbxmx

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+<roblox xmlns:xmime="http://www.w3.org/2005/05/xmlmime" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://www.roblox.com/roblox.xsd" version="4">
+	<Meta name="ExplicitAutoJoints">true</Meta>
+	<External>null</External>
+	<External>nil</External>
+	<Item class="Folder" referent="RBX10E3276249364E44B1EBE3BF36E14C1D">
+		<Properties>
+			<BinaryString name="AttributesSerialize"><![CDATA[DwAAAAMAAABOYU4GAAAAAAAA+P8IAAAASW5maW5pdHkGAAAAAAAA8H8NAAAAQ29sb3JTZXF1
+ZW5jZRkDAAAAAAAAAAAAAAAAAIA/AAAAAAAAAAAAAAAAAAAAPwAAAAAAAIA/AAAAAAAAAAAA
+AIA/AAAAAAAAAAAAAIA/BwAAAFZlY3RvcjMRAACAPwAAAEAAAEBABwAAAFZlY3RvcjIQAAAg
+QQAASEIOAAAATnVtYmVyU2VxdWVuY2UXAwAAAAAAAAAAAAAAAACAPwAAAAAAAAA/AAAAAAAA
+AAAAAIA/AACAPwYAAABDb2xvcjMPo6IiPwAAAAAAAIA/CgAAAEJyaWNrQ29sb3IO7AMAAAQA
+AABSZWN0HAAAgD8AAABAAABAQAAAgEAFAAAAVURpbTIKAAAAPwoAAAAzMzM/HgAAAAQAAABV
+RGltCQAAAD9kAAAACwAAAE51bWJlclJhbmdlGwAAoEAAACBBBgAAAE51bWJlcgYAAAAAgBzI
+QAcAAABCb29sZWFuAwEGAAAAU3RyaW5nAg0AAABIZWxsbywgd29ybGQh]]></BinaryString>
+			<string name="Name">Folder</string>
+			<int64 name="SourceAssetId">-1</int64>
+			<BinaryString name="Tags"></BinaryString>
+		</Properties>
+	</Item>
+</roblox>