add min and max value for int16 and uint16

Author: Yu-zh

int16/int16.mbt

@@ -12,6 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+///|
+pub let max_value : Int16 = 32767
+
+///|
+pub let min_value : Int16 = -32768
+
 ///|
 pub fn op_add(self : Int16, that : Int16) -> Int16 {
   (self.to_int() + that.to_int()).to_int16()

int16/int16.mbti

@@ -1,6 +1,9 @@
 package moonbitlang/core/int16
 
 // Values
+let max_value : Int16
+
+let min_value : Int16
 
 // Types and methods
 impl Int16 {

uint16/uint16.mbt

@@ -12,6 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+///|
+pub let max_value : UInt16 = 65535
+
+///|
+pub let min_value : UInt16 = 0
+
 ///|
 pub fn op_add(self : UInt16, that : UInt16) -> UInt16 {
   (self.to_int() + that.to_int()).to_uint16()

uint16/uint16.mbti

@@ -1,6 +1,9 @@
 package moonbitlang/core/uint16
 
 // Values
+let max_value : UInt16
+
+let min_value : UInt16
 
 // Types and methods
 impl UInt16 {