Encrypt helper (longportapp#25)

* add EncryptPassword helper function

* fix: should not override x-timestamp

* Update signature.go

use headerTimestamp

* more detail of encrypt

* remove useless code

* Update encrypt.go

remove empty line

http client support set request header (longportapp#24)

chore: retract [v0.0.1, v0.7.1]

Create codeql.yml

Update README.md

chore: en syntax

update openapi-protocol/go to fix reconnect bug

Add order detail interface and add estimate maximum purchase quantity…

… interface (longportapp#22)

* add order detail interface

* add Estimate Maximum Purchase Quantity interface

add remark field on order (longportapp#21)

* add remark field on order

* add remark field on order jsontype

add some LongBridge Protocol options (longportapp#20)

* support .env

* add longbridge options

update openapi-protocol/go to v0.2.2