Merge branch '178-add-hints-for-required-selections' into 'master'

Resolve "Change symptom category descriptions to make clear which are required (for mucus and cervix) for fertility detection"

Closes #178

See merge request bloodyhealth/drip!153

styles/index.js

@@ -17,6 +17,7 @@ const fontRegular = 'Prompt-Light'
 const fontLight = 'Prompt-Thin'
 
 const regularSize = 16
+const hintSize = 14
 
 const defaultBottomMargin = 5
 const defaultIndentation = 10
@@ -34,6 +35,12 @@ export default StyleSheet.create({
     fontFamily: fontLight,
     fontSize: regularSize
   },
+  actionHint: {
+    color: secondaryColor,
+    fontFamily: fontRegular,
+    fontSize: hintSize,
+    margin: defaultIndentation
+  },
   paragraph: {
     marginBottom: defaultBottomMargin
   },