chore: add .gitignore and remove deprecated Travis CI config

Author: Nexus

.gitignore

@@ -0,0 +1,43 @@
+# Binaries
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+
+# Go workspace
+go.work
+
+# Vendor
+vendor/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Build output
+bin/
+dist/
+build/
+
+# Logs
+*.log
+
+# Uploads (example)
+uploads/
+
+# Test coverage
+coverage.out
+
+# Certs
+*.pem
+*.key