added overview readme

loops/primes/bak

@@ -0,0 +1,12 @@
+def is_prime(n: int) -> bool:
+    # TODO: implement
+    return False
+
+
+def next_prime(n: int) -> int:
+    return -1
+
+
+def prime_factorize(n: int) -> list[int]:
+    # TODO: implement
+    return []