update ordering and numbering of all packages

Author: mohnoor94

README.md

@@ -1,4 +1,4 @@
-package _01_intro
+package _000_intro
 
 import java.time.LocalDate
 

src/main/scala/_01_intro/_01_Loops.sc renamed to src/main/scala/_000_intro/_01_Loops.sc

@@ -1,4 +1,4 @@
-package _01_intro
+package _000_intro
 
 object _06_Tuples extends App {
   val t = (1, "Hello", 3.2)

src/main/scala/_01_intro/_02_Strings.sc renamed to src/main/scala/_000_intro/_02_Strings.sc

@@ -1,4 +1,4 @@
-package _02_functions
+package _010_functions
 
 class Foo(x: Int) {
   def bar(y: Int): Int = x + y

src/main/scala/_01_intro/_03_Methods.sc renamed to src/main/scala/_000_intro/_03_Methods.sc

@@ -1,4 +1,4 @@
-package _02_functions
+package _010_functions
 
 object _01_2_Functions extends App {
   //  val f0 = (s: String) => s.length