Include some practice demos during my Golang learning.

• helloworld.go - Hello world, standard output and package import.
• go.mod - Go Module
• testfor
  • testfor.go - For loop, array and normal var initialization.
  • testslice.go - Slice initialization.
• testmap
  • testmap.go - Map initialization and traverse.
• teststruct
  • teststruct.go - Struct initialization.
  • testoop.go - OOP in go.
  • testitf.go - Interface and Polymorphism.
• testassert
  • testpair.go - Pair in go.
  • testassert - Normal usage of assertation.
• testreflect
  • testresflect.go - Reflect in go.
• testjson
  • testjson.go - Json parse and jsonify.
• testxorm
  • testxorm.go - xorm framework quick start.
• testredis
  • testredis.go - go-redis quick start.

• Goroutine and channel has not been introduced yet.
• Maybe new commit in the future...