Placeholder IPIP database with test data

[iBug]

Prepare a test version of IPIP database with minimal data so that unit tests can be implemented, and that other contributors can work with our code.

Requirements for the test DB file:

• Contain 3 fields: country_name, region_name and line (ISP)
• Contain 1 IPv4 CIDR range matching each of the following criteria:
  • 中国 北京 教育网 (Use Tsinghua University)
  • 中国 安徽 教育网 (Use University of Science and Technology of China)
  • 中国 上海 电信 (Example: 202.96.209.5 - ChinaNet public DNS server in Shanghai)
  • 中国 陕西 教育网 (Use Xi'an Jiaotong University)
  • 中国 广东 教育网 (Use South China University of Technology)
  • 中国 广东 电信 (Example: 202.96.128.86 - ChinaNet public DNS server in Guangzhou)

This Node.js project is a good reference for creating the IPDB file and populating it with specified data.