add explanations of matching strings

strings/8D0DDC

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+Store to $DC0D
+
+This single instruction stores to $DC0D.
+This cannot be copyrighted.

strings/8D0DDD

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+Store to $DD0D
+
+This single instruction stores to $DD0D.
+This cannot be copyrighted.

strings/A9118D

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+Store value $11 somewhere in memory
+LDA #$11
+STA $xxxx
+
+This is the obvious way to put $11 into a memory location, and thus not copyrightable.

strings/A9818D0DDC

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+Enable CIA1 TimerA interrupt minimal instruction sequence
+LDA #$81
+STA $DC0D

strings/AD0DDD

@@ -0,0 +1,4 @@
+Read from $DD0D
+
+This single instruction reads the value stored in $DD0D.
+This cannot be copyrighted.

strings/F0036C

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+Branch over following JMP ($nnnn) instruction
+A branch with argument $03 skips the following 3 bytes.
+A JSR instruction has the initial byte value of $20.
+Therefore $F0 $XX $20 is part of a 
+Bxx +
+JMP ($xxxx)
+*
+
+instruction sequence.
+This is a very common construction, and the logical way to 
+conditionally call a routine via a vector, and therefore is not copyrightable.