Update readme.md

Author: ip2location

readme.md

@@ -5,32 +5,9 @@ This library allows user to query an IP address if it was being used as open pro
 - Free IP2Proxy BIN Data: [https://lite.ip2location.com](https://lite.ip2location.com/)
 - Commercial IP2Proxy BIN Data: https://www.ip2location.com/proxy-database
 
-## Requirement
+## Developer Documentation
+To learn more about installation, usage, and code examples, please visit the developer documentation at [https://ip2proxy-r.readthedocs.io/en/latest/index.html.](https://ip2proxy-r.readthedocs.io/en/latest/index.html)
 
-IP2Proxy R package required IP2Proxy Python library to work. In order to install IP2Proxy Python library, you can use the following command:
-
-   ```Python
-   pip install IP2Proxy
-   ```
-
-## Installation
-
-1. In your RStudio IDE, type the following command into the console:
-
-   ```R
-   install.packages("devtools")
-   require(devtools)
-   ```
-
-2. After that, install IP2Proxy R package by using the following command: `install_github("ip2location/ip2proxy-r")`
-
-## Usage
-
-1. Load IP2Proxy BIN database by the following command: `ip2proxy::open(path_to_your_database)`
-2. Query all the proxy information for an IP address by this command: `ip2proxy::get_all(ip_address)`
-3. To know whether an IP address is a proxy or not, you can do this by: `ip2proxy::is_proxy(ip_address)`
-4. Query the proxy information for an IP address using web service: `ip2proxy::lookup_web_service(your_api_key, ip_address, package)`
-5. To plot IP addresses on the map: ip2proxy::plot_map(c(list_of_ip_addresses))
 
 ## Proxy Type