Update variables.md (#382)

Add local variables with block construct section

source/learn/quickstart/variables.md

@@ -201,3 +201,30 @@ end program float
 
 In the next part we will learn how to use arrays for storing more than one
 value in a variable.
+
+## Local scope variables with `block` construct
+The 2008 Fortran standard introduced the notion of `block` which enables using local scope variables within a program or procedure.
+
+**Example:**
+
+```{play-code-block} fortran
+module your_module
+    implicit none
+    integer :: n = 2
+end module
+
+program main
+    implicit none
+    real :: x
+
+    block
+        use your_module, only: n ! you can import modules within blocks
+        real :: y ! local scope variable
+        y = 2.0
+        x = y ** n
+        print *, y
+    end block
+    ! print *, y ! this is not allowed as y only exists during the block's scope
+    print *, x  ! prints 4.00000000
+end program
+```