Added hello world robot framework

Robot/hello-word.robot

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+*** Settings ***
+Library    SeleniumLibrary
+Suite Setup    Open google.com by google chrome
+Suite Teardown   End Browser
+Test Teardown    Back to google.com
+Test Template    Search google by keyword
+*** Variables ***
+${GOOGLE URL}    https://google.com
+${WEB BROWSER}    googlechrome
+
+*** Keywords ***
+Search google by keyword
+    [Arguments]    ${KEYWORD}
+    Enter text in the search box    ${KEYWORD}
+    Press the search button
+
+Open google.com by google chrome
+    Open Browser    ${GOOGLE URL}    ${WEB BROWSER}
+    Wait Until Element Is Visible    id=lst-ib
+
+Enter text in the search box
+    [Arguments]    ${KEYWORD}
+    Input Text    id=lst-ib    ${KEYWORD}
+
+Press the search button
+    Press Key    name=btnK    13
+    Click Button    name=btnK
+
+Back to google.com
+    Go To    ${GOOGLE URL}
+
+End Browser
+    Close Browser
+
+*** Testcases ***
+search-helloworld    hello world
+search-hacktoberfest    Hacktoberfest-2018/Hello-world