docs: enhance project with docker documentation.

README.md

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+<h1 align="center">GeoQuery.in</h1>
+<h4 align="center">Open Mapping Infrastructure</h4>
+
+### Vision
+Our [vision](./vision.md).
+
+### Example
+See code example in the [server](./server/app.js) folder.
+
+### Setup Server
+
+Run `./setup.sh`. This script will install bun and download required files to setup server
+```sh
+cd server
+./setup.sh
+```
+
+Start Server
+```sh
+bun app.js
+```
+
+### Docker Container Setup and Usage Guide
+
+This guide provides instructions for using the Docker container to deploy and interact with the application. The Docker container contains an application that provides location information based on district centroids.
+
+#### Prerequisites
+
+Before getting started, ensure that you have Docker installed on your system. Refer to the [Docker installation documentation](https://docs.docker.com/get-docker/) for installation instructions based on your operating system.
+
+#### Setup Docker Container
+
+Once Docker is installed, follow the steps below to set up and run the Docker container:
+
+1. Clone the repository containing the Dockerfile and application files.
+    ```bash
+    git clone https://github.com/ChakshuGautam/geoquery.in
+    ```
+2. Change working dir to `server`
+    ```bash
+    cd geoquery.in/server
+    ```
+4. Build the Docker image using the provided Dockerfile with the following command:
+
+   ```bash
+   docker build . -t geoquery
+   ```
+   > Note: After adding your user to the Docker group, you can run Docker commands without using `sudo`. If you haven't added your user to the Docker group, remember to use `sudo` before Docker commands.
+
+5. Run the Docker container using the following command:
+
+   ```bash
+   docker run -d geoquery
+   ```
+
+This command will start the Docker container in detached mode, allowing you to interact with the application.
+
+#### Interacting with the Application
+
+Once the Docker container is running, you can interact with the application using the provided commands.
+
+1. Check Docker Container Status
+
+    To check the status of the Docker container, use the following command:
+
+    ```bash
+    docker ps
+    ```
+
+    This command will display a list of running Docker containers along with their details. Store "Container ID"
+
+2. Retrieve Container IP Address
+
+    To retrieve the IP address of the Docker container, use the following command:
+
+    ```bash
+    docker inspect <container_id> | grep -i "ipaddress" | grep -o '"IPAddress": "[^"]*' | grep -o '[^"]*$' | head -n1
+    ```
+
+    Replace `<container_id>` with the ID of the running Docker container.
+
+3. Access Application Endpoint
+
+    To access the application endpoint and retrieve location information, use the following command:
+
+    ```bash
+    curl "http://<container_ip_address>:3000/location/DISTRICT/centroid?query=<location_query>"
+    ```
+
+    Replace `<container_ip_address>` with the IP address of the Docker container obtained in the previous step, and `<location_query>` with the desired location query.
+
+    Example:
+
+    ```bash
+    curl "http://172.17.0.2:3000/location/DISTRICT/centroid?query=lucknow"
+    ```
+    > Here we have replaced `<container_ip_address>` with the actual IP address we obtained.
+    This command will retrieve information about the centroid of the district "Lucknow".
+
+
+### API
+Works with both ipv4 and ipv6.
+
+Get geolocation corresponding to given IP
+```sh
+curl https://geoip.samagra.io/city/128.101.101.101
+```
+
+Get geolocation for given `lat` & `lon`
+```shell
+curl https://geoip.samagra.io/georev?lat=28.7041&lon=77.1025
+```
+
+Get polygon centroid for given `STATE/DISTRICT/SUBDISTRICT` with some query
+```shell
+curl https://geoip.samagra.io/location/DISTRICT/centroid?query=lucknow
+```
+
+Fuzzy search location by name with `STATE/DISTRICT/SUBDISTRICT/VILLAGE` levels with query & location level filters in request body, `filter` keys should one of these `STATE/DISTRICT/SUBDISTRICT/VILLAGE`.
+```shell
+curl --location 'https://geoip.samagra.io/location/VILLAGE/fuzzysearch' \
+--header 'Content-Type: application/json' \
+--data '{
+    "query": "Arong",
+    "filter": {
+        "STATE": "Andaman & Nicobar Islands",
+        "DISTRICT": "Nicobars"
+    }
+}'
+# Response
+{
+    "matches": [
+        {
+            "state": "Andaman & Nicobar Islands",
+            "district": "Nicobars",
+            "subDistrict": "Car Nicobar",
+            "village": "Arong"
+        }
+    ]
+}
+```
+### Notes
+
+DB will remain updated automatically. Please create a ticket if you see some issues.
+
+
+### Contribution Guide
+1. Please consider issues up from grabs.
+2. It will only be assigned with a PR.