data: add "summer_rain" chord files (verse, chorus)

data/raw_user/summer_rain-chorus.chord

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+# title: Summer Rain
+# key: Db_major
+# time: 4/4
+# subdivision: 4
+# style: H1K0
+# function: chorus
+
+| Db . . . | Bbm . . . | Fm . . . | Gb . Ab . |
+| Db . . . | Bbm . Ab . | Ebm . . . | Gb . Absus4 Ab |

data/raw_user/summer_rain-verse.chord

@@ -0,0 +1,9 @@
+# title: Summer Rain
+# key: Db_major
+# time: 4/4
+# subdivision: 4
+# style: H1K0
+# function: verse
+
+| Db . . . | Db/F . . . | Gbsus2 . . . | Ab . . . |
+| Db . . Ab/C | Bbm7 . . Ab | Gbmaj9 . . . | Gbmaj9 . Absus4 Ab |