Create GraphQL-Playground.md

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# GraphQL Playground
To use the GraphQL Playground we have to know some basics:
## How To Login?
At first we have to have a user of ocelot.social as whom we can login.
The user can be created by seeding the Neo4j database from the backend or by several GraphQL mutations.
### Seed The Neo4j Database
In your browser you reach the GraphQL Playground under `http://localhost:4000/`
if the database and the backend is running, see [backend](../../backend/README.md).
You can find how to seed there as well.
### Use GraphQL Mutations To Create A User
TODO: Describe how to create a user by GraphQL mutations!
### Login Via GraphQL
You can login by sending the query:
```gql
mutation ($email: String!, $password: String!) {
login(email: $email, password: $password)
}
```