Initial data commit

Task/Variables/BBC-BASIC/variables.basic

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+      REM BBC BASIC (for Windows) has the following scalar variable types;
+      REM the type is explicitly indicated by means of a suffix character.
+      REM Variable names must start with A-Z, a-z, _ or `, and may contain
+      REM any of those characters plus 0-9 and @; they are case-sensitive.
+
+      A& = 123      : REM Unsigned 8-bit byte (0 to 255)
+      A% = 12345678 : REM Signed 32-bit integer (-2147483648 to +2147483647)
+      A  = 123.45E6 : REM Variant 40-bit float or 32-bit integer (no suffix)
+      A# = 123.45E6 : REM Variant 64-bit double or 32-bit integer
+      A$ = "Abcdef" : REM String (0 to 65535 bytes)
+
+      REM Scalar variables do not need to be declared but must be initialised
+      REM before being read, otherwise a 'No such variable' error is reported
+      REM The static integer variables A% to Z% are permanently defined.
+
+      REM BBC BASIC also has indirection operators which allow variable-like
+      REM entities to be created in memory:
+
+      DIM addr 7    : REM Allocate 8 bytes of heap
+      ?addr = 123   : REM Unsigned 8-bit byte (0 to 255)
+      !addr = 12345 : REM Signed 32-bit integer (-2147483648 to +2147483647)
+      |addr = 12.34 : REM Variant 40-bit or 64-bit float or 32-bit integer
+      $addr = "Abc" : REM String terminated by CR (0 to 65535 bytes)
+      $$addr = "Abc": REM String terminated by NUL (0 to 65535 bytes)
+
+      REM The integer indirection operators may be used in a dyadic form:
+      offset = 4
+      addr?offset = 12345678 : REM Unsigned 8-bit byte at addr+offset
+      addr!offset = 12345678 : REM Signed 32-bit integer at addr+offset
+
+      REM All variables in BBC BASIC have global scope unless they are used
+      REM as a formal parameter of a function or procedure, or are declared
+      REM as LOCAL or PRIVATE.  This is different from most other BASICs.