define default font sizes

theme.json

@@ -55,6 +55,50 @@
       "wideSize": "1760px"
     },
     "typography": {
+      "fontSizes": [
+        {
+					"fluid": false,
+					"name": "Tiny",
+					"size": "14px",
+					"slug": "tiny"
+				},
+        {
+					"fluid": false,
+					"name": "Small",
+					"size": "16px",
+					"slug": "small"
+				},
+				{
+					"fluid": false,
+					"name": "Medium",
+					"size": "18px",
+					"slug": "medium"
+				},
+				{
+					"fluid": false,
+					"name": "Large",
+					"size": "24px",
+					"slug": "large"
+				},
+				{
+					"fluid": false,
+					"name": "Extra Large",
+					"size": "30px",
+					"slug": "x-large"
+				},
+				{
+					"fluid": false,
+					"name": "Extra Extra Large",
+					"size": "48px",
+					"slug": "xx-large"
+				},
+        {
+					"fluid": false,
+					"name": "Huge",
+					"size": "56px",
+					"slug": "huge"
+				}
+      ],
       "fontFamilies": [
         {
           "fontFace": [