P1-P5: init

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

P4.java

@@ -0,0 +1,15 @@
+class P4 {
+  public static void main(String[] _args) {
+      int n = 10;
+      int a = 0, b = 1;
+      System.out.println("First " + n + " elements of the fibonacci series:");
+      new P4().fibo(n, a, b);
+  }
+
+    void fibo(int n, int a, int b) {
+        if (n == 0)
+            return;
+        System.out.println(a);
+        fibo(n - 1, b, a + b);
+    }
+}