[decimal] Implement round() for BigDecimal

README.md

@@ -47,6 +47,7 @@ For the latest development version, clone the [GitHub repository](https://github
 | ---------- | ------ |
 | v0.1.0     | >=25.1 |
 | v0.2.0     | >=25.2 |
+| v0.3.0     | >=25.2 |
 
 ## Quick start
 

benches/bigdecimal/bench.mojo

@@ -6,6 +6,7 @@ from bench_bigdecimal_sqrt import main as bench_sqrt
 from bench_bigdecimal_exp import main as bench_exp
 from bench_bigdecimal_ln import main as bench_ln
 from bench_bigdecimal_root import main as bench_root
+from bench_bigdecimal_round import main as bench_round
 from bench_bigdecimal_scale_up_by_power_of_10 import main as bench_scale_up
 
 
@@ -23,6 +24,7 @@ sqrt:        Square root
 exp:         Exponential
 ln:          Natural logarithm
 root:        Root
+round:       Round
 all:         Run all benchmarks
 q:           Exit
 =========================================
@@ -47,6 +49,8 @@ scaleup:     Scale up by power of 10
         bench_ln()
     elif command == "root":
         bench_root()
+    elif command == "round":
+        bench_round()
     elif command == "all":
         bench_add()
         bench_sub()
@@ -56,6 +60,7 @@ scaleup:     Scale up by power of 10
         bench_exp()
         bench_ln()
         bench_root()
+        bench_round()
     elif command == "q":
         return
     elif command == "scaleup":