add support for RobotFramework .robot files

samples/RobotFramework/data_driven.robot

@@ -0,0 +1,45 @@
+*** Settings ***
+Documentation     Example test cases using the data-driven testing approach.
+...
+...               Tests use `Calculate` keyword created in this file, that in
+...               turn uses keywords in `CalculatorLibrary`. An exception is
+...               the last test that has a custom _template keyword_.
+...
+...               The data-driven style works well when you need to repeat
+...               the same workflow multiple times.
+...
+...               Notice that one of these tests fails on purpose to show how
+...               failures look like.
+Test Template     Calculate
+Library           CalculatorLibrary
+
+*** Test Cases ***    Expression    Expected
+Addition              12 + 2 + 2    16
+                      2 + -3        -1
+
+Subtraction           12 - 2 - 2    8
+                      2 - -3        5
+
+Multiplication        12 * 2 * 2    48
+                      2 * -3        -6
+
+Division              12 / 2 / 2    3
+                      2 / -3        -1
+
+Failing               1 + 1         3
+
+Calculation error     [Template]    Calculation should fail
+                      kekkonen      Invalid button 'k'.
+                      ${EMPTY}      Invalid expression.
+                      1 / 0         Division by zero.
+
+*** Keywords ***
+Calculate
+    [Arguments]    ${expression}    ${expected}
+    Push buttons    C${expression}=
+    Result should be    ${expected}
+
+Calculation should fail
+    [Arguments]    ${expression}    ${expected}
+    ${error} =    Should cause error    C${expression}=
+    Should be equal    ${expected}    ${error}    # Using `BuiltIn` keyword