doc: document group endpoints

doc/api/group.md

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+# Group Endpoints
+
+## POST `/group/create` (auth required)
+
+### Description
+
+Creates a group and returns a UID (UUID formatted).
+Groups do not have names, or any other descriptive attributes.
+Instead they are always identified with a UUID, and they have
+a `metadata` property.
+
+The `metadata` property will always be given back to the client
+in the same way it was provided. The `extra` property, also an
+object, may be changed by the backend. The behavior of setting
+any property on `extra` is currently undefined as all properties
+are reserved for future use.
+
+### Parameters
+
+- **metadata:** _- optional_
+  - **accepts:** `object`
+  - **description:** arbitrary metadata to describe the group
+- **extra:** _- optional_
+  - **accepts:** `object`
+  - **description:** extra parameters (server may change these)
+
+### Request Example
+
+```javascript
+await fetch(`${window.api_origin}/group/create`, {
+  "headers": {
+    "Content-Type": "application/json",
+    "Authorization": `Bearer ${puter.authToken}`,
+  },
+  "body": JSON.stringify({
+    metadata: { title: 'Some Title' }
+  }),
+  "method": "POST",
+});
+
+// { uid: '9c644a1c-3e43-4df4-ab67-de5b68b235b6' }
+```
+
+### Response Example
+
+```json
+{
+    "uid": "9c644a1c-3e43-4df4-ab67-de5b68b235b6"
+}
+```
+
+## POST `/group/add-users`
+
+### Description
+
+Adds one or more users to a group
+
+### Parameters
+
+- **uid:** _- required_
+  - **accepts:** `string`
+    UUID of an existing group
+- **users:** `Array<string>`
+  usernames of users to add to the group
+
+### Request Example
+
+```javascript
+await fetch(`${window.api_origin}/group/add-users`, {
+  "headers": {
+    "Content-Type": "application/json",
+    "Authorization": `Bearer ${puter.authToken}`,
+  },
+  "body": JSON.stringify({
+      uid: '9c644a1c-3e43-4df4-ab67-de5b68b235b6',
+      users: ['first_user', 'second_user'],
+  }),
+  "method": "POST",
+});
+```
+
+## POST `/group/remove-users`
+
+### Description
+
+Remove one or more users from a group
+
+### Parameters
+
+- **uid:** _- required_
+  - **accepts:** `string`
+    UUID of an existing group
+- **users:** `Array<string>`
+  usernames of users to remove from the group
+
+### Request Example
+
+```javascript
+await fetch(`${window.api_origin}/group/add-users`, {
+  "headers": {
+    "Content-Type": "application/json",
+    "Authorization": `Bearer ${puter.authToken}`,
+  },
+  "body": JSON.stringify({
+      uid: '9c644a1c-3e43-4df4-ab67-de5b68b235b6',
+      users: ['first_user', 'second_user'],
+  }),
+  "method": "POST",
+});
+```
+
+# Group Permission Endpoints
+
+## POST `/grant-user-group`
+
+Grant permission from the current user to a group.
+This creates an association between the user and the
+group for this permission; the group will only have
+the permission effectively while the user who granted
+permission has the permission.
+
+### Parameters
+
+- **group_uid:** _- required_
+  - **accepts:** `string`
+    UUID of an existing group
+- **permission:** _- required_
+  - **accepts:** `string`
+    A permission string
+
+### Request Example
+
+```javascript
+await fetch("http://puter.localhost:4100/auth/grant-user-group", {
+  "headers": {
+    "Content-Type": "application/json",
+    "Authorization": `Bearer ${puter.authToken}`,
+  },
+  "body": JSON.stringify({
+      group_uid: '9c644a1c-3e43-4df4-ab67-de5b68b235b6',
+      permission: 'fs:/someuser/somedir/somefile:read'
+  }),
+  "method": "POST",
+});
+```
+
+## POST `/revoke-user-group`
+
+Revoke permission granted from the current user
+to a group.
+
+### Parameters
+
+- **group_uid:** _- required_
+  - **accepts:** `string`
+    UUID of an existing group
+- **permission:** _- required_
+  - **accepts:** `string`
+    A permission string
+
+### Request Example
+
+```javascript
+await fetch("http://puter.localhost:4100/auth/grant-user-group", {
+  "headers": {
+    "Content-Type": "application/json",
+    "Authorization": `Bearer ${puter.authToken}`,
+  },
+  "body": JSON.stringify({
+      group_uid: '9c644a1c-3e43-4df4-ab67-de5b68b235b6',
+      permission: 'fs:/someuser/somedir/somefile:read'
+  }),
+  "method": "POST",
+});
+```
+
+- > **TODO** figure out how to manage documentation that could
+    reasonably show up in two files. For example: this is a group
+    endpoint as well as a permission system endpoint.
+    (architecturally it's a permission system endpoint, and
+    the permissions feature depends on the groups feature;
+    at least until a time when PermissionService is refactored
+    so a service like GroupService can mutate the permission
+    check sequences)