message: [skip ci] update doc types for oracle and mssql
diff: @@ -87,4 +87,51 @@ Since SQLite adopts a [dynamic type system](https://www.sqlite.org/datatype3.htm
  | TIME | object | declared type is "time" |
  | TIMESTAMP | datetime64[ns] | declared type is "datetime" or "timestamp" |
  +## Oracle
  +Oracle does not need to specify protocol.
  +
  +### Oracle-Pandas Type Mapping
  +| Oracle Type | Pandas Type | Comment |
  +|:---------------:|:---------------------------:|:----------------------------------:|
  +| Number(\*,0) | int64, Int64(nullable) | |
  +| Number(\*,>0) | float64 | |
  +| Float | float64 | |
  +| VARCHAR2 | object | |
  +| CHAR | object | |
  +| NCHAR | object | |
  +| NVarchar2 | object | |
  +| DATE | datetime64[ns] | |
  +| TIMESTAMP | datetime64[ns] | |
  +
  +## SQLServer
  +
  +SQLServer does not need to specify protocol.
  +
  +### SQLServer-Pandas Type Mapping
  +| SQLServer Type | Pandas Type | Comment |
  +|:---------------:|:---------------------------:|:----------------------------------:|
  +| TINYINT | int64, Int64(nullable) | |
  +| SMALLINT | int64, Int64(nullable) | |
  +| INT | int64, Int64(nullable) | |
  +| BIGINT | int64, Int64(nullable) | |
  +| FLOAT | float64 | |
  +| NUMERIC | float64 | |
  +| DECIMAL | float64 | |
  +| BIT | bool, boolean(nullable) | |
  +| VARCHAR | object | |
  +| CHAR | object | |
  +| TEXT | object | |
  +| NVARCHAR | object | |
  +| NCHAR | object | |
  +| NTEXT | object | |
  +| VARBINARY | object | |
  +| BINARY | object | |
  +| IMAGE | object | |
  +| DATETIME | datetime64[ns] | |
  +| DATETIME2 | datetime64[ns] | |
  +| SMALLDATETIME | datetime64[ns] | |
  +| DATE | datetime64[ns] | |
  +| DATETIMEOFFSET | datetime64[ns] | |
  +| TIME | object | |
  +| UNIQUEIDENTIFIER| object | |
  