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Update ifs_data_model.md

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# Data model
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# L1-IFS Data model
## File: CSST_IFS_CUBE_{OBJ_id}_{VER_cube}_{LIN/LOG}_{STM_cube}.fits
### File contents
| HDU | data | note |
|------|-------------------------|------------|
| HDU0 | None | PrimaryHDU |
| HDU1 | FLUX | ImageHDU |
| HDU2 | IVAR | ImageHDU |
| HDU3 | MASK | ImageHDU |
| HDU4 | EXP_NUM | ImageHDU |
| HDU5 | LSF | ImageHDU |
| HDU6 | WEIGHT_MARTIX | ImageHDU |
| HDU7 | rRSS_FILE_LIST | BinTableHDU|
### HDU0
| keyword | value | comment | fill value | type | module |
|---------|:------|---------------|---------------|------|--------------|
| SIMPLE | True | Fits standard | True | bool |csst_ifs_cube |
### HDU0
#### Header of `csst_ifs_cube`
| keyword | value | comment | fill value | type | module |
|-----------|:----------------------|---------------------------------------------------|--------------|------|--------------------------|
| RSS_VER |: R6100 | version of RSS code | RXXXX |str | csst_ifs_cube |
| CUB_VER |: C6100 | version of CUBE code | CXXXX |str | csst_ifs_cube |
| COV_VER |: C6100 | version of CUBE code | CXXXX |str | csst_ifs_cube |
| LSF_VER |: C6100 | version of CUBE code | CXXXX |str | csst_ifs_cube |
| FLUXUNIT |: '1E-17 erg/s/cm2/A/arcsec2' | unit of flux | '1E-17 erg/s/cm2/A/arcsec2'|str | csst_ifs_cube |
| FLUXSCALE |: 1 | Intensity unit scaling | 1 |I8 | csst_ifs_cube |
| FLUXZERO |: 0 | Intensity zeropoint | 0 |I8 | csst_ifs_cube |
|TELESCOP |: CSST | Telescope used to acquire data | CSST |str | csst_ifs_cube |
|INSTRUMENT |: IFS | Identifier for instrument used to acquire data | IFS |str | csst_ifs_cube |
|OBJID |: 174053.8-534326' | ID of Object(in the form of HHMMSS.S+DDMMSS) | hhmmss.sddmmss|str | csst_ifs_cube |
|NEXP |: 50 | number of science exposures combined | 0 |I8 | csst_ifs_cube |
|EXPTIME |: 60000 | Total exposure time | 0 |f32 | csst_ifs_cube |
|MJDMIN |: 2459955.2275463 | Minimum OBS MJD across all exposures | -9999 |f32 | csst_ifs_cube |
|MJDMAX |: 2459955.39282407 | Maximum OBS MJD across all exposures | -9999 |f32 | csst_ifs_cube |
|MJDMED |: 2459955.34074074 | Median OBS MJD across all exposures | -9999 |f32 | csst_ifs_cube |
|WCSCAL_VER |: A6101 | Version of WCS calibration | AXXX |str | csst_ifs_cube |
|WCSCAL_P |: | file for WCS calibration | "?" |str | csst_ifs_cube |
|RADECSYS |: FK5 | Frame of reference of coordinates | FK5 |str | csst_ifs_cube |
|EQUINOX |: 2000.0 | 　 | 2000.0 |str | csst_ifs_cube |
|OBJRA |: 265.22407917 |Object R.A. (J2000 deg.) | -9999 |f32 | csst_ifs_cube |
|OBJDEC |: -53.72406389 |Object Dec. (J2000 deg.) | -9999 |f32 | csst_ifs_cube |
|CENRA |: 265.2240087483441 |Plate center R.A. (J2000 deg.) R4 | -9999 |f32 | csst_ifs_cube |
|CENDEC |: -53.72410555664603 |Plate center Dec. (J2000 deg.) R4 | -9999 |f32 | csst_ifs_cube |
|CTYPE3 |: 'LIN' | The type of wavelength array | 'LIN' |str | csst_ifs_cube |
|CRPIX3 |:1.0 | Starting pixel | -9999 |f32 | csst_ifs_cube |
|CRVAL3 |: 3500.0 | The central wavelength wv0 of first pixel | -9999 |f32 | csst_ifs_cube |
|CD3_3 |: 1.75 | wavelength dispersion per pixel | -9999 |f32 | csst_ifs_cube |
|CUNIT3 |: 'Angstrom' | unit of wavelength | 'Angstrom' |str | csst_ifs_cube |
|CRPIX1 |: 49.0 | Reference pixel | -9999 |f32 | csst_ifs_cube |
|CRPIX2 |: 52.0 | Reference pixel | -9999 |f32 | csst_ifs_cube |
|CRVAL1 |: 265.22407917 | RA of reference point | -9999 |f32 | csst_ifs_cube |
|CRVAL2 |: -53.72406389 | Dec of reference point | -9999 |f32 | csst_ifs_cube |
|CD1_1 |: -2.7777777777777E-05 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube |
|CD1_2 |: 0.0 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube |
|CD2_1 |: 0.0 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube |
|CD2_2 |: 2.7777777777778E-05 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube |
|CTYPE1 |: 'RA---TAN' | Declination, gnomonic projection | 'RA---TAN' |str | csst_ifs_cube |
|CTYPE2 |: 'DEC--TAN' | Declination, gnomonic projection | 'DEC--TAN' |str | csst_ifs_cube |
|CUNIT1 |: 'deg' | Units of coordinate increment and value | 'deg' |str | csst_ifs_cube |
|CUNIT2 |: 'deg' | Units of coordinate increment and value | 'deg' |str | csst_ifs_cube |
|EBVGAL |: 0 | Galactic reddening E(B-V) | -9999 |f32 | csst_ifs_cube |
|CHECKSUM |: 0 |checksum | 1 |I8 | csst_ifs_cube |
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