Added a potential roadmap file

docs/ROADMAP.md

@@ -0,0 +1,14 @@
+v1.1.0 — Template richness + uninstall
+  - Template metadata (template.toml with descriptions, file counts, test counts)
+  - anvil uninstall (remove arduino-cli, AVR core, etc.)
+  - More templates: servo, i2c, pid-control
+
+v1.2.0 — Community library ecosystem
+  - Remote library registry (packages.nxgit.dev)
+  - anvil add nexus/sensors/ultrasonic
+  - anvil search, anvil update
+  - Versioned library dependencies in .anvil.toml
+
+v1.3.0 — Developer experience
+  - Windows MSI installer (cargo-wix)
+  - GUI (Tauri) for teams uncomfortable with terminals