api docs for package create

pages/apis/rest_api/packages/packages.md

@@ -2,6 +2,49 @@
 
 The packages tokens API lets you create and manage packages in a registry.
 
+## Upload a package
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" \
+  -X POST "https://api.buildkite.com/v2/packages/organizations/#{org.slug}/registries/#{registry.slug}/packages" \
+  -H "Content-Type: application/json" \
+  -F 'file=@path/to/ruby/gem/banana-1.0.0.gem'
+```
+
+```json
+{
+  "id": "0191e23a-4bc8-7683-bfa4-5f73bc9b7c44",
+  "url": "https://api.buildkite.com/v2/packages/organizations/my_great_org/registries/my-registry/packages/0191e23a-4bc8-7683-bfa4-5f73bc9b7c44",
+  "web_url": "https://buildkite.com/organizations/my_great_org/packages/registries/my-registry/packages/0191e23a-4bc8-7683-bfa4-5f73bc9b7c44",
+  "name": "banana",
+  "organization": {
+    "id": "0190e784-eeb7-4ce4-9d2d-87f7aba85433",
+    "slug": "my_great_org",
+    "url": "https://api.buildkite.com/v2/organizations/my_great_org",
+    "web_url": "https://buildkite.com/my_great_org"
+  },
+  "registry": {
+    "id": "0191e238-e0a3-7b0b-bb34-beea0035a39d",
+    "graphql_id": "UmVnaXN0cnktLS0wMTkxZTIzOC1lMGEzLTdiMGItYmIzNC1iZWVhMDAzNWEzOWQ=",
+    "slug": "my-registry",
+    "url": "https://api.buildkite.com/v2/packages/organizations/my_great_org/registries/my-registry",
+    "web_url": "https://buildkite.com/organizations/my_great_org/packages/registries/my-registry"
+  }
+}
+```
+
+Required request form-field content:
+
+<table class="responsive-table">
+<tbody>
+  <tr><th><code>file</code></th><td>Path to the package.<br><em>Example:</em> <code>"file=@path/to/ruby/gem/banana-1.0.0.gem"</code>.</td></tr>
+</tbody>
+</table>
+
+Required scope: `create_packages`
+
+Success response: `200 OK`
+
 ## Get a package
 
 Returns the details for a single package.