add data link

README.md

@@ -10,5 +10,5 @@
 2. modify the config file in the folder config/
 3. run: python run_sim.py config/congfig_galsim.yaml
 
-We generate some csst mock data using GOODS-North data as input, include CSST NUV, u, g, r, i, z, y 7 bands mock data.Everay band mock data use the exposure time 150s*1(CSST wide-field Survy) and 250s*8(CSST deep Survey). And you can download the mock data from
+We generate some csst mock data using GOODS-North data as input, include CSST NUV, u, g, r, i, z, y 7 bands mock data.Everay band mock data use the exposure time 150s x 1(CSST wide-field Survy) and 250s x 8(CSST deep Survey). And you can download the mock data from
 link: https://pan.baidu.com/s/1GunqQcChbeqbf6gEf9L5pw?pwd=qvuy extract code: qvuy