Update .gitignore to include .vscode directory; modify run.sh to append Main.java to sources.txt

.gitignore

@@ -2,3 +2,4 @@ build/
 instance/
 *.class
 *.db
+.vscode/

run.sh

@@ -9,6 +9,7 @@ if ! command -v java >/dev/null 2>&1; then
 fi
 
 find src -name "*.java" > sources.txt
+echo "Main.java" >> sources.txt
 if ! javac -d build -cp "./extern/sqlite-jdbc-3.50.3.0.jar" @sources.txt Main.java; then
     echo "Error: javac failed to compile sources."
     exit 1