Initial data commit

Task/Binary-strings/BBC-BASIC/binary-strings.basic

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+      A$ = CHR$(0) + CHR$(1) + CHR$(254) + CHR$(255) : REM assignment
+      B$ = A$                                        : REM clone / copy
+      IF A$ = B$ THEN PRINT "Strings are equal"      : REM comparison
+      IF A$ = "" THEN PRINT "String is empty"        : REM Check if empty
+      A$ += CHR$(128)                                : REM Append a byte
+      S$ = MID$(A$, S%, L%)                          : REM Extract a substring
+      C$ = A$ + B$                                   : REM Join strings
+
+      REM To replace every occurrence of a byte:
+      old$ = CHR$(1)
+      new$ = CHR$(5)
+      REPEAT
+        I% = INSTR(A$, old$)
+        IF I% MID$(A$, I%, 1) = new$
+      UNTIL I% = 0