add graddle support

Author: Shizheng001

ip-add-gradle-support/docs/README.md

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+# User Guide
+
+## Features 
+
+### Feature 1 
+Description of feature.
+
+## Usage
+
+### `Keyword` - Describe action
+
+Describe action and its outcome.
+
+Example of usage: 
+
+`keyword (optional arguments)`
+
+Expected outcome:
+
+`outcome`

ip-add-gradle-support/text-ui-test/EXPECTED.TXT

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+Hello from
+ ____        _        
+|  _ \ _   _| | _____ 
+| | | | | | | |/ / _ \
+| |_| | |_| |   <  __/
+|____/ \__,_|_|\_\___|
+

ip-add-gradle-support/text-ui-test/runtest.bat

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+@ECHO OFF
+
+REM create bin directory if it doesn't exist
+if not exist ..\bin mkdir ..\bin
+
+REM delete output from previous run
+del ACTUAL.TXT
+
+REM compile the code into the bin folder
+javac  -cp ..\src -Xlint:none -d ..\bin ..\src\main\java\Duke.java
+IF ERRORLEVEL 1 (
+    echo ********** BUILD FAILURE **********
+    exit /b 1
+)
+REM no error here, errorlevel == 0
+
+REM run the program, feed commands from input.txt file and redirect the output to the ACTUAL.TXT
+java -classpath ..\bin Duke < input.txt > ACTUAL.TXT
+
+REM compare the output to the expected output
+FC ACTUAL.TXT EXPECTED.TXT