add viirs cloud microphys composite for I and M

as suggested in pytroll#2258

satpy/etc/composites/viirs.yaml

@@ -359,6 +359,26 @@ composites:
     - M12
     - M15
     standard_name: night_microphysics
+
+  day_microphysics:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: M07
+      modifiers: [sunz_corrected]
+    - name: M12
+      modifiers: [nir_reflectance]
+    - M15
+    standard_name: day_microphysics
+
+  hr_day_microphysics:
+    compositor: !!python/name:satpy.composites.GenericCompositor
+    prerequisites:
+    - name: I02
+      modifiers: [sunz_corrected_iband]
+    - name: I04
+      modifiers: [nir_reflectance_hires]
+    - I05
+    standard_name: day_microphysics 
 
   fog:
     compositor: !!python/name:satpy.composites.GenericCompositor