Update commands docs

docs/Commands.md

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+# Command Line Interface
+
+## run
+
+Run a ZiQL query on the selected database.
+
+**Usage:**
+
+```
+run QUERY
+```
+
+## db
+
+**Usage:**
+
+```
+db COMMAND
+```
+
+### db metrics
+
+Print some metrics from the db, including: Size on disk and number of entities stored.
+
+**Usage:**
+
+```
+db metrics [OPTIONS]
+```
+
+**Options:**
+
+Name | Type | Description         | Default
+---- | ---- | ------------------- | ----
+TODO | TODO | TODO | TODO
+
+### db new
+
+Create a new empty directory that can be then initialize with a schema.
+
+**Usage:**
+
+```
+db new path/to/dir [OPTIONS]
+```
+
+**Options:**
+
+Name | Type | Description         | Default
+---- | ---- | ------------------- | ----
+TODO | TODO | TODO | TODO
+
+### db use
+
+Select an already created database with `db new`.
+
+**Usage:**
+
+```
+db use path/to/dir [OPTIONS]
+```
+
+**Options:**
+
+Name | Type | Description         | Default
+---- | ---- | ------------------- | ----
+TODO | TODO | TODO | TODO
+
+### db state - WIP
+
+Return the state of the database, either `MissingDatabase` if no database selected or `MissingSchema` if no schema was initialize.
+
+**Usage:**
+
+```
+db state
+```
+
+## schema
+
+### schema init
+
+Initialize the database using a schema file.
+
+**Usage:**
+
+```
+schema use path/to/schema.file [OPTIONS]
+```
+
+**Options:**
+
+Name | Type | Description         | Default
+---- | ---- | ------------------- | ----
+TODO | TODO | TODO | TODO
+
+## quit
+
+Quit the CLI.
+
+**Usage:**
+
+```
+quit
+```
+
+## help
+
+Write an help message.
+
+**Usage:**
+
+```
+help
+```