Book Updates

-add chapter 5.2

Author: ktechhydle

book/chapter5.2.md

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+---
+title: "Chapter 5.2"
+---
+
+# Chapter 5.2: Strings
+
+A string is also considered a collection, due to the fact it is a **collection of characters**.
+
+We can perform many string operations (similar to lists) like indexing, reversing, and even joining!
+
+```
+obj my_string = "12345";
+obj first_char = charat(my_string, 0); # '1'
+```
+
+## String Operations
+
+The string type actually doesn't have the ability to modify in place; i.e. it is **immutable**. For most string operations, you actually create a new copy that can be assigned to something. Reversing a string is a great example, as the string is copied, then recreated in reverse.
+
+```
+obj forwards = "abcd";
+obj backwards = reverse(forwards); # 'dcba'
+```
+
+Strings support some mathematical operands too. The `+` operand adds two strings together, and you can even use the `*` operator to multiply a string.
+
+```
+obj hello_world = "Hello, " + "world!"; # 'Hello, world!'
+obj excited_happy_birthday = "Happy Birthday!" * 3; # 'Happy Birthday!Happy Birthday!Happy Birthday!'
+```
+
+## Other String Operations
+
+Just like lists, strings come with a bunch of built-in operations other than the ones listed here. A full list of available operations is in the [String Documentation](/docs/types/string#operations).