Add .gitignore template for Solidity + Remix

Solidity-Remix.gitignore

@@ -0,0 +1,15 @@
+# Remix compiler artifacts
+**/artifacts/
+**/artifacts/**
+
+# Remix plugin state folders
+deps/
+states/
+
+# Debug info
+*.dbg.json
+*.tsbuildinfo
+
+# Optional
+.env
+.env.local