Initial documents for qosmngr, with ubus and uci schema files and generated .md

• Added shaping, policer and classification uci default parameters.
• Added classification parameter under uci schema and docs
• Corrected default values for classify parameters
• Comments disposition, updated missing parameters in classify uci schema

@shubham Under docs folder qos.md has same content as uci.qos.md. qos.md should be auto-generated document from ubus json schema and contain ubus API documentation.

In configs, burst_size is -1 whereas it should be 0.

@sukrus files corrected and config value changed to 0. Please check.

merged

mentioned in commit f14a1fef