add readme

app/README.md

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+# Installation
+```bash
+docker pull fuxialexander/getdemo:latest
+docker run -it -v "/path/to/data:/data" --rm -p 7681:7681 fuxialexander/getdemo
+```
+The gradio interface will be available at http://127.0.0.1:7681, a sharable link will be printed in the terminal.
+
+# Data preparation
+Put the data in the following structure in the root directory of the project.
+```bash
+data
+├── sequences
+│   └── causal
+│       ├── MECP2_TFAP2A
+│       ├── PRDM1_SMAD2
+│       └── TAF1_ZFX
+└── structures
+    ├── causal
+    │   ├── MECP2_TFAP2A
+    │   ├── PRDM1_SMAD2
+    │   └── TAF1_ZFX
+    └── homodimer
+        ├── PRDM1
+        ├── SMAD2
+        ├── TAF1
+        └── ZFX
+```