strings.md added in the kotlin folder

content/kotlin/concepts/strings/strings.md

@@ -0,0 +1,61 @@
+---
+Title: 'Strings'
+Description: 'Strings are immutable objects that are sequences of characters contained within a pair of double quotes.'
+Subjects:
+  - 'Computer Science'
+Tags:
+  - 'Strings'
+  - 'Data Types'
+  - 'Characters'
+CatalogContent:
+  - 'learn-kotlin'
+  - 'paths/computer-science'
+---
+
+**Strings** are immutable objects that represents a sequence of characters contained within double quotes (`""`).
+
+## Syntax
+
+```pseudo
+val stringName: String = "string value"
+```
+
+In Kotlin, string values are always defined as instances of the `String` class.
+## Example
+
+Here is an example of how you might use strings in Kotlin:
+
+```kotlin
+fun main(args: Array<String>) {
+  val greeting: String = "Hello, World!"
+  println(greeting)
+}
+```
+
+The output for the above code will be:
+
+```shell
+Hello, World!
+```
+
+## String Templates
+
+Templates can also be used to dynamically produce string values. Dynamic values don't have to start as strings, and can either be directly referenced with a dollar sign (`$`) or evaluated as a string with additional curly braces (`{}`). The following showcases both techniques:
+
+```kotlin
+val dynamicValue = 4
+val stringOne: String = "The value of dynamicValue is $dynamicValue"
+System.out.println(stringOne)
+
+val a = 4
+val b = 5
+val stringTwo: String = "The sum of a and b is ${a + b}"
+System.out.println(stringTwo)
+```
+
+This will print the following output:
+
+```shell
+The value of dynamicValue is 4
+The sum of a and b is 9
+```