Add .gitignore for MQL development

.gitignore

@@ -0,0 +1,25 @@
+# MQL Compiled Files
+*.ex4
+*.ex5
+
+# MT5 Build Logs
+*.log
+
+# Temporary Files
+*.tmp
+*~
+.DS_Store
+
+# IDE
+.vscode/
+.idea/
+*.iml
+
+# Backups
+*.bak
+*.old
+
+# Large data files (if any)
+*.hcc
+*.hc
+*.dat