Add tasks for all the new languages

Task/Keyboard-input-Flush-the-keyboard-buffer/Axe/keyboard-input-flush-the-keyboard-buffer.axe

@@ -0,0 +1,2 @@
+While getKey(0)
+End

Task/Keyboard-input-Flush-the-keyboard-buffer/ERRE/keyboard-input-flush-the-keyboard-buffer.erre

@@ -0,0 +1,6 @@
+!$KEY
+..........
+REPEAT
+   GET(K$)
+UNTIL K$=""
+..........

Task/Keyboard-input-Flush-the-keyboard-buffer/FreeBASIC/keyboard-input-flush-the-keyboard-buffer.freebasic

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+' FB 1.05.0 Win64
+
+' Get characters from the keyboard buffer until there are none left
+While Inkey <> "" : Wend
+Print "Keyboard buffer flushed"
+Sleep

Task/Keyboard-input-Flush-the-keyboard-buffer/Nim/keyboard-input-flush-the-keyboard-buffer.nim

@@ -0,0 +1,4 @@
+const TCIFLUSH: cint = 0
+proc tcflush(fd, queue_selector: cint): cint {.header: "termios.h".}
+
+discard tcflush(cint(getFileHandle(stdin)), TCIFLUSH)

Task/Keyboard-input-Flush-the-keyboard-buffer/Oforth/keyboard-input-flush-the-keyboard-buffer.oforth

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+import: console
+
+System.Console flush

Task/Keyboard-input-Flush-the-keyboard-buffer/Phix/keyboard-input-flush-the-keyboard-buffer.phix

@@ -0,0 +1 @@
+while get_key()!=-1 do end while

Task/Keyboard-input-Flush-the-keyboard-buffer/Sidef/keyboard-input-flush-the-keyboard-buffer.sidef

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+var k = frequire('Term::ReadKey');
+
+k.ReadMode('restore');    # Flush the keyboard and returns input stream to initial state
+# ReadMode 0;             # Numerical equivalent of keyboard restore (move comment marker to use instead)
+
+# A more complete example for use in keyboard handler programming.
+# We should also check we are being used in an interactive context (not done here).
+
+k.ReadMode('cbreak');
+
+# Flush the keyboard in terminal character break mode
+while (k.ReadKey(-1) != nil) {
+   # Do nothing
+}
+
+# Don't forget to restore the readmode, when we are finished using the keyboard
+k.ReadMode('restore');