update with new character specific functions

Sources/SwiftSerial.swift

@@ -445,6 +445,25 @@ extension SerialPort {
         let newlineChar = CChar(10) // Newline/Line feed character `\n` is 10
         return try readUntilChar(newlineChar)
     }
+
+    public func readChar() throws -> UnicodeScalar {
+        let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: 1)
+        
+        defer {
+            buffer.deallocate(capacity: 1)
+        }
+
+        while true {
+            let bytesRead = try readBytes(into: buffer, size: 1)
+
+            if bytesRead > 0 {
+                let character = UnicodeScalar(buffer[0])
+                return character     
+            }
+        }         
+
+    }
+
 }
 
 // MARK: Transmitting
@@ -480,4 +499,10 @@ extension SerialPort {
 
         return try writeData(data)
     }
+
+    public func writeChar(_ character: UnicodeScalar) throws -> Int{
+        let stringEquiv = String(character)
+        let bytesWritten = try writeString(stringEquiv)
+        return bytesWritten
+    }
 }