adding tahoma style sheets. Provide better readability for Arabic or Farsi

themes/css/tahoma-08.css

@@ -0,0 +1,13 @@
+body, td, th, dd, dt, h1, h2, h3, h4, h5, h6, p, ol, ul, li {
+  font-family: tahoma,sans-serif;
+}
+body, small {
+  font-size: 6pt;
+}
+td, th {
+  font-size: 8pt;
+}
+textarea, pre {
+  font-family: monospace;
+  font-size: 7pt;
+}

themes/css/tahoma-10.css

@@ -0,0 +1,13 @@
+body, td, th, dd, dt, h1, h2, h3, h4, h5, h6, p, ol, ul, li {
+  font-family: tahoma,sans-serif;
+}
+body, small {
+  font-size: 8pt;
+}
+td, th {
+  font-size: 10pt;
+}
+textarea, pre {
+  font-family: monospace;
+  font-size: 9pt;
+}

themes/css/tahoma-12.css

@@ -0,0 +1,13 @@
+body, td, th, dd, dt, h1, h2, h3, h4, h5, h6, p, ol, ul, li {
+  font-family: tahoma,sans-serif;
+}
+body, small {
+  font-size: 10pt;
+}
+td, th {
+  font-size: 12pt;
+}
+textarea, pre {
+  font-family: monospace;
+  font-size: 11pt;
+}