add bjson library & update /doc/en/scripting/filesystem.md

doc/en/scripting/filesystem.md

@@ -75,6 +75,55 @@ file.mkdirs(path: str) -> bool
 
 Create directories chain. Returns true if new directory created.
 
+## *json* library
+
+The library contains functions for serializing and deserializing tables:
+
+```python
+json.tostring(object: table, human_readable: bool=false) -> str
+```
+
+Serializes an object into a JSON string. If the second parameter is **true**, multi-line human-readable formatting will be used, rather than the compact format used by default.
+
+```python
+json.parse(code: str) -> table
+```
+
+Parses a JSON string into a table.
+
+## *toml* library
+
+The library contains functions for serializing and deserializing tables:
+
+```python
+toml.tostring(object: table) -> str
+```
+
+Serializes an object into a TOML string.
+
+```python
+toml.parse(code: str) -> table
+```
+
+Parses a TOML string into a table.
+
+## *bjson* library
+
+The library contains functions for working with the binary data exchange format [vcbjson](../../specs/binary_json_spec.md).
+
+```lua
+-- Encodes a table into a byte array
+bjson.tobytes(
+    -- encoded table
+    value: table,
+    -- compression
+    [optional] compression: bool=true
+) --> Bytearray
+
+-- Decodes a byte array into a table
+bjson.frombytes(bytes: table | Bytearray) --> table
+```
+
 ## Storing data in a world
 
 When saving pack data in the world, you should use the function: