added ssh key management resource

docs/resources/public_key.md

@@ -0,0 +1,52 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "gitea_public_key Resource - terraform-provider-gitea"
+subcategory: ""
+description: |-
+  gitea_public_key manages ssh key that are associated with users.
+---
+
+# gitea_public_key (Resource)
+
+`gitea_public_key` manages ssh key that are associated with users.
+
+## Example Usage
+
+```terraform
+resource "gitea_user" "test" {
+  username             = "test"
+  login_name           = "test"
+  password             = "Geheim1!"
+  email                = "test@user.dev"
+  must_change_password = false
+}
+
+
+resource "gitea_public_key" "test_user_key" {
+  title     = "test"
+  key       = file("${path.module}/id_ed25519.pub")
+  username  = gitea_user.test.username
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `key` (String, Sensitive) An armored SSH key to add
+- `title` (String) Title of the key to add
+- `username` (String) User to associate with the added key
+
+### Optional
+
+- `read_only` (Boolean) Describe if the key has only read access or read/write
+
+### Read-Only
+
+- `created` (String)
+- `fingerprint` (String)
+- `id` (String) The ID of this resource.
+- `type` (String)
+
+