Add tasks for all the new languages

Task/Binary-strings/Ring/binary-strings.ring

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+# string creation
+x = "hello world"
+
+# string destruction
+x = NULL
+
+# string assignment with a null byte
+x = "a"+char(0)+"b"
+see len(x)  # ==> 3
+
+# string comparison
+if x = "hello"
+  See "equal"
+else
+  See "not equal"
+ok
+y = 'bc'
+if strcmp(x,y) < 0
+  See x + " is lexicographically less than " + y
+ok
+
+# string cloning
+xx = x
+See x = xx       # true, same length and content
+
+# check if empty
+if x = NULL
+  See "is empty"
+ok
+
+# append a byte
+x += char(7)
+
+# substring
+x = "hello"
+x[1] = "H"
+See x + nl
+
+# join strings
+a = "hel"
+b = "lo w"
+c = "orld"
+See a + b + c