Added rarity files for Hobbit

Entirely unused, but I don't know that gemp won't ring up an error without them.

gemp-lotr/gemp-lotr-cards/src/main/resources/set21-rarity.txt

@@ -0,0 +1,58 @@
+21S1
+21S2
+21S3
+21S4
+21S5
+21S6
+21S7
+21S8
+21S9
+21S10
+21S11
+21S12
+21S13
+21S14
+21S15
+21S16
+21S17
+21S18
+21S19
+21S20
+21S21
+21S22
+21S23
+21S24
+21S25
+21S26
+21S27
+21S28
+21S29
+21S30
+21S31
+21S32
+21S33
+21S34
+21S35
+21S36
+21S37
+21S38
+21S39
+21S40
+21S41
+21S42
+21S43
+21S44
+21S45
+21S46
+21S47
+21S48
+21S49
+21S50
+21S51
+21S52
+21S53
+21S54
+21S55
+21S56
+21S57
+21S58

gemp-lotr/gemp-lotr-cards/src/main/resources/set22-rarity.txt

@@ -0,0 +1 @@
+ 

gemp-lotr/gemp-lotr-cards/src/main/resources/set23-rarity.txt

@@ -0,0 +1 @@
+