Create to.md

Start of TO keyword documentation

Author: MrKOSMOS

docs/to.md

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+# TO
+
+**TO** is a keyword used to specify a sequence of numbers to be used in a statement.
+
+a TO b (STEP c) will give the statement a sequence of numbers starting at a and ending at [the closest number less than or equal to] b, 
+with each number after a being the previous number plus 1, or c if the STEP keyword is used (only supported by FOR).
+In the case of a TO b with a and b integers, the sequence will include both a and b.
+A, B and C can be expressions, can be floating point numbers [FOR i = 0 TO PI / 2 STEP q - circle.bas.md]
+Statements that can be used with TO are FOR, DIM [DIM b(0 TO 10) - dim.md, DIM a(3 TO 5, 1 TO 8) - lbound.md, only dimensions, indexes will only be valid within the declared range], [variable value assignments? NO, not even arrays], NOT array, string indexing [s$(TO N - 1) - left.md, s$(len(s$) - N - 1 TO) - right.md]
+GO TO, despite having TO, is a different statement and these rules do not apply to it