Add .gitignore files to quickstart templates (#4609)

Fixes #4582

Templates created via `spacetime init` were missing `.gitignore` files,
causing build artifacts like `node_modules`, `target/`, `bin/`, `obj/`,
`dist/`, `.next/`, etc. to show up in git diffs when users initialize a
project inside a git repository.

Adds `.gitignore` files to the 15 templates that were missing one:

| Template | Ignores |
|----------|---------|
| Node/TS (`basic-ts`, `browser-ts`, `bun-ts`, `chat-react-ts`,
`deno-ts`, `nodejs-ts`, `react-ts`, `vue-ts`) | `node_modules`, `dist`,
`*.log` |
| Next.js (`nextjs-ts`) | `node_modules`, `.next`, `out`, `dist`,
`*.log` |
| Svelte (`svelte-ts`) | `node_modules`, `dist`, `.svelte-kit`, `*.log`
|
| Rust (`basic-rs`, `chat-console-rs`) | `target` |
| C# (`basic-cs`, `chat-console-cs`) | `bin`, `obj` |
| C++ (`basic-cpp`) | `target`, `build` |

All files also include `spacetime.local.json` and `.DS_Store`.

The 5 templates that already had `.gitignore` files (`angular-ts`,
`keynote-2`, `nuxt-ts`, `remix-ts`, `tanstack-ts`) are left unchanged.

Co-authored-by: clockwork-labs-bot <clockwork-labs-bot@users.noreply.github.com>

templates/basic-cpp/.gitignore

@@ -0,0 +1,6 @@
+target
+build
+
+.DS_Store
+
+spacetime.local.json

templates/basic-cs/.gitignore

@@ -0,0 +1,6 @@
+bin
+obj
+
+.DS_Store
+
+spacetime.local.json

templates/basic-rs/.gitignore

@@ -0,0 +1,5 @@
+target
+
+.DS_Store
+
+spacetime.local.json

templates/basic-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/browser-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/bun-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/chat-console-cs/.gitignore

@@ -0,0 +1,6 @@
+bin
+obj
+
+.DS_Store
+
+spacetime.local.json

templates/chat-console-rs/.gitignore

@@ -0,0 +1,5 @@
+target
+
+.DS_Store
+
+spacetime.local.json

templates/chat-react-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/deno-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/nextjs-ts/.gitignore

@@ -0,0 +1,9 @@
+node_modules
+.next
+out
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/nodejs-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/react-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/svelte-ts/.gitignore

@@ -0,0 +1,8 @@
+node_modules
+dist
+.svelte-kit
+*.log
+
+.DS_Store
+
+spacetime.local.json

templates/vue-ts/.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+*.log
+
+.DS_Store
+
+spacetime.local.json