Created FileParser class

- Created FileParser class which processes team setting file in Json format.
- Implement get** methods, which extract information from setting file more efficient.
- Took more time than expected because need to learn Json-simple dependency first.
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src/main/java/seng302/FileParser.java

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+package seng302;
+
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.FileNotFoundException;
+import java.util.ArrayList;
+
+
+/**
+ * Read team name from a given Json file. So that user can extract information
+ * efficiently from external files.
+ */
+
+public class FileParser {
+
+	private String filePath;
+	private JSONObject content;
+	/** used to construct an instance of file parser
+	 *
+	 * @param filePath a string like path to show location of desired file to
+	 *                 be parsed
+	 */
+	public FileParser(String filePath) throws Exception {
+		this.filePath = filePath;
+		this.readFile();
+	}
+
+	/**
+	 * Reads content from a given file, and return the content as JSONObject.
+	 * Throws FileNotFoundException, if the given file cannot be found.
+	 */
+	private void readFile() throws FileNotFoundException{
+		JSONParser parser = new JSONParser();
+		try {
+			Object obj = parser.parse(new FileReader(filePath));
+
+			JSONObject jsonObject = (JSONObject) obj;
+			this.content = jsonObject;
+		} catch (FileNotFoundException e) {
+			throw e;
+		} catch (IOException e) {
+			e.printStackTrace();
+		} catch (ParseException e) {
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * Gets time scale setting parameter.
+	 * @return long time scale. -1 if parameter is invalid (eg. scale is
+	 * negative number, or containing non numeric character) or cannot be found.
+	 */
+	public long getTimeScale() {
+		try {
+			long timeScale = (long) this.content.get("time-scale");
+			return timeScale >= 0 ? timeScale : -1;
+		} catch (Exception e) {
+			return -1;
+		}
+	}
+
+	/**
+	 * Gets race name in the setting file.
+	 * @return a string of race name. null if race name is invalid or cannot
+	 * be found.
+	 */
+	public String getRaceName() {
+		try {
+			return (String) this.content.get("race-name");
+		} catch (Exception e) {
+			return null;
+		}
+	}
+
+	/**
+	 * Gets an array of teams who participate the race.
+	 * @return an ArrayList containing strings of team names. null if teams
+	 * setting is invalid or there is no team.
+	 */
+	public ArrayList<String> getTeams() {
+		try {
+			return (ArrayList<String>) this.content.get("teams");
+		} catch (Exception e) {
+			return null;
+		}
+	}
+
+}