add example sources definition, license, option to specify sources file

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Kenneth Watson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

sources-example.ini

@@ -0,0 +1,11 @@
+[Unreal Tournament v469b]
+out=ut99v469b
+paths=/path/to/ut99/469b/
+
+[Unreal Tournament v436]
+out=ut99v436
+paths=/path/to/ut99/436/
+
+[Unreal Tournament 2004 v3369]
+out=ut2004v3369
+paths=/path/to/ut99/3369/

src/main/java/net/shrimpworks/unreal/scriptbrowser/App.java

@@ -45,7 +45,7 @@ public static void main(String[] args) throws IOException {
 
 		final Path outPath = Paths.get(cli.commands()[0]);
 
-		final List<USources> sources = createSourcesFromProperties();
+		final List<USources> sources = createSourcesFromProperties(cli.option("sources", "sources.ini"));
 
 		if (!cli.flag("skip-sources")) {
 			for (USources source : sources) {
@@ -92,8 +92,8 @@ public static void main(String[] args) throws IOException {
 		System.err.println("Done");
 	}
 
-	private static List<USources> createSourcesFromProperties() throws IOException {
-		final IniFile config = new IniFile(Paths.get("sources.ini"));
+	private static List<USources> createSourcesFromProperties(String sources) throws IOException {
+		final IniFile config = new IniFile(Paths.get(sources));
 		return config.sections().stream()
 					 .map(s -> new USources(
 						 s,