docs: add README.md

README.md

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+# InstaDownloader
+
+A simple tool can help you download an Instagram (public) account's all pictures.
+
+![](docs/Screenshot_20221208_005332.png)
+## Usage
+
+1. download dependencies
+
+    ```
+    pip install requests tqdm
+    ```
+
+2. get IG app ID
+
+    open you Instagram on your browser & open DevTool(F12)
+    ![](docs/Screenshot_20221208_010109.png)
+
+    network -> select "timeline/"
+    ![](docs/Screenshot_20221208_010210.png)
+
+    find "x-ig-app-id"
+    ![](docs/Screenshot_20221208_010318.png)
+
+    paste to `main.py`
+    ![](docs/Screenshot_20221208_010537.png)
+
+3. Start
+
+    find username
+    ![](docs/Screenshot_20221208_011128.png)
+
+    ```
+    python main.py [username]
+    ```
+    ![](docs/Screenshot_20221208_011344.png)
+
+4. check
+
+    find pictures in `./images/[username]`
+    ![](docs/Screenshot_20221208_011751.png)
+
+> Please respect the intellectual property rights