Add a README

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+#+TITLE: Tutor
+
+A collection manager for Magic: The Gathering playing cards.
+
+* Searching
+Text in the search bar will be used to filter cards having that text in their
+name. Additionally, the keyword expressions below can be used to search for
+cards with certain properties.
+
+** Examples
+
+- ~bolt~ :: Find all cards with "bolt" in the name
+- ~"God of"~ :: Find all cards with "God of" in the name
+- ~t:legendary t:creature c:jund~ :: Find all legendary creatures with a color
+  identity of red/blue/green
+- ~color<=ubg~ :: Find all spells that are blue, black, green, or any
+  combination thereof.
+- ~color:red set:stx rarity>=rare~ :: Find all red cards in Strixhaven that are
+  rare or mythic
+- ~t:enchantment o:"enters the battlefield"~ :: Find all enchantments with ETB
+  effects
+
+** Keywords
+*** Colors
+- Keywords :: =c=, =color=
+- Operators :: ~:~ (matches), ~>=~ (greater than or equal to), ~<=~ (less than
+  or equal to)
+
+Matches cards of the chosen color or colors.
+
+- Single colors :: =w= or =white=, =u= or =blue=, =b= or =black, =g= or =green=, =r= or =red=
+- Any combination of abbreviated single colors :: e.g.: =rg=, =uw=, or =wubgr=
+- Ravnican guilds :: =boros= (white/red), =golgari= (green/black), =selesnya=
+  (green/white), =dimir= (blue/black), =orzhov= (white/black), =izzet=
+  (blue/red), =gruul= (red/green), =azorius= (white/blue), =rakdos= (black/red),
+  =simic= (green/blue)
+- Alaran shards :: =bant= (white/green/blue), =esper= (blue/white/black),
+  =grixis= (black/blue/red), =jund= (red/blue/green), =naya= (green/red/white)
+- Tarkirian wedges :: =abzan= (white/black/green), =jeskai= (white/blue/red),
+  =sultai= (blue/black/green), =mardu= (white/black/red), =temur=
+  (blue/red/green)
+
+*** Sets
+- Keywords :: =s=, =set=, =e=, =expansion=
+- Operators :: ~:~ (matches)
+
+*** Rarity
+- Keywords :: =r=, =rarity=
+- Operators :: ~:~ (matches), ~>=~ (greater than or equal to), ~<=~ (less than
+  or equal to)
+
+*** Type
+- Keywords :: =t=, =type=
+- Operators :: ~:~ (matches)
+
+*** Oracle Text
+- Keywords :: =o=, =oracle=
+- Operators :: ~:~ (matches)