wip(markdown): More work on backend docs

markdown/dev/reference/backend/api/account/create/en.md

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+---
+title: Create an account
+---
+
+Creates a new User account. The User account will remain inactive 
+until [it is confirmed](/reference/backend/api/account/confirm).
+
+## Endpoints
+
+Creating a new User account is possible via this endpoint:
+
+| Method    | Path | Authentication |
+| --------: | :--- | :------------- |
+| <Method post /> | `/signup` | None |
+
+<Note compact>This endpoint requires no authentication</Note>
+
+## Request body
+
+| Property    | Type     | Description |
+| ----------: | :------- | :---------- |
+| `email`     | `string` | The E-mail address of the User |
+| `language`  | `boolean`| The language code for the User |
+
+## Response status codes
+
+Possible status codes for these endpoints are:
+
+| Status code | Description |
+| ----------: | :---------- |
+| <StatusCode status="201"/> | success |
+| <StatusCode status="400"/> | the request was malformed |
+| <StatusCode status="500"/> | server error |
+
+<Note>
+If the status code is not <StatusCode status="201" /> the `error` property
+in the response body should indicate the nature of the problem.
+</Note>
+
+## Response body
+
+| Value               | Type     | Description |
+| ------------------- | -------- | ----------- |
+| `result`            | String | Either `success` or `error` |
+| `error`             | String | Will give info on the nature of the error. Only set if an error occured. |
+| `email`             | String | The E-mail address where the confirmation email was sent to |
+
+## Example request
+
+```js
+const signup = await axios.post(
+  'https://backend.freesewing.org/signup',
+  {
+    email: "joost@joost.at",
+    language: "en"
+  }
+)
+```
+
+## Example response
+```201.json
+{
+  "result": "success",
+  "email": "joost@joost.at"
+}
+```