Update line number section in the docs to add highlight line number methods

Author: AmrDeveloper

docs/line-number.md

@@ -8,7 +8,7 @@ Starting From version 1.1.1 CodeView now have support for line number.
 codeView.setEnableLineNumber(enableLineNumber);
 ```
 
-### Check if line number is enabled
+### Check if line number feature is enabled
 
 ```
 codeView.isLineNumberEnabled();
@@ -20,12 +20,30 @@ codeView.isLineNumberEnabled();
 codeView.setEnableRelativeLineNumber(enableRelativeLineNumber);
 ```
 
-### Check if relative line number is enabled
+### Check if relative line number feature is enabled
 
 ```
 codeView.isLineRelativeNumberEnabled();
 ```
 
+### Enable/Disable highlight current line
+
+```
+codeView.setEnableHighlightCurrentLine(enableHighlightCurrentLine);
+```
+
+### Check if highlight current line feature is enabled
+
+```
+codeView.isHighlightCurrentLineEnabled();
+```
+
+### Set highlight current line color
+
+```
+codeView.setHighlightCurrentLineColor(Color.GREY);
+```
+
 ### Set line number text color
 
 ```