update README.md

README.md

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 # Spin-based map-making simulation
 
-This repository brings together code for performing map-based simulations with cross-linking.
-The crosslink maps are generated in HDF5 format earlier by Falcons.jl, and the notebook loads them and provides classes to link them to the physical quantities of the CMB observations.
+<p align="center">
+  <h1>
+  <img src="./maps/sca_fields.png" alt="Logo">
+  </h1>
+</p>
 
-In the future, a concrete pipeline for handling Diff sistematics etc. could be implemented.
+![build status](https://github.com/yusuke-takase/SBM/actions/workflows/test.yml/badge.svg?branch=master)
+
+This code assesses the impact of differential systematics on CMB polarisation observations.
+
+`ScanFields` such as hit-map and cross-link map, pre-simulated by [Falcons.jl](https://github.com/yusuke-takase/Falcons.jl), are coupled with sky temperature and polarization fields, including systematics effects, at a given $spin$.
+
+# Instllation
+
+```
+git clone https://github.com/yusuke-takase/SBM.git
+cd sbm
+pip install -e .
+```
+
+# Tutorials
+
+There are several tutorials in the [notebooks](https://github.com/yusuke-takase/SBM/tree/master/notebooks).
+Although you need to download the required ScanFields datased given by Falcons, you can simulate any time-independent systematics if you have a signal model.
+Now, following systematics are implemented:
+
+- Differential gain
+- Differential pointing