data(spells): add batch 3 of PC spell list (32 spells)

data/spells/summon_instrument.json

@@ -0,0 +1,10 @@
+{
+  "name": "Summon Instrument",
+  "level": 0,
+  "school": "conjuration",
+  "range": "personal",
+  "save": "none",
+  "base_dc": 10,
+  "effects": [],
+  "description": "A cantrip (casting time 1 round): you summon one handheld musical instrument of your choice into your hands or at your feet; it plays only for you and disappears when the spell ends (1 min./level). No combat effect: summoned objects are not modeled by the engine."
+}