add text tasks in module 3 and 4; update package url in go.mod

Author: xiao

go.mod

@@ -1,4 +1,4 @@
-module github.com/xiaounb/go_cli_playbook
+module github.com/pluralsight-projects/golang-cli-playbook
 
 go 1.13
 

task/module3.md

@@ -10,27 +10,30 @@ To test this module locally:
 * Run command `go test -run Module3` to run all tests for module 3, or
 * Run command `go test -v -run Module3` to run all tests for module 3 with verbose information
 
-## Task 1
-To add dependencies to current module and install the packages, we use the [`go get` command](https://golang.org/cmd/go/#hdr-Add_dependencies_to_current_module_and_install_them).
+## Task 1: Get help information for `go get`
+The [`go get` command](https://golang.org/cmd/go/#hdr-Add_dependencies_to_current_module_and_install_them) will be used to download and install packages.
 The syntax can be as simple as this:
 ```
 go get <package>
 ```
 
 The above `package` can be the git repo of the package if hosted on github (that is, without the `https://` prefix).
 
+To get more information, check the output of `go help get`.
+
+To list all packages in the module, you can use `go list -m all`. 
+Help on `list` can be found at `go help list`
+
+
+## Task 2: Use `go get` to install a package
+To add dependencies to current module and install the packages, we use the `go get` command.
+
 Your task is to write a command to import the following package which can be used to retrieve the sunrise and sunset time given a location and a date. Here is the github repo:
 ```
 https://github.com/nathan-osman/go-sunrise
 ```
 
-In the terminal, type in the command to import the above package.
-
+In the terminal, type in the complete command to import the above package.
 
 
-## Extra help
-Here is the command to get more information on `go get`: 
-- `go help get`
 
-To list all packages in the module, you can use `go list -m all`. Help on `list` can be found at:
-- `go help list`

task/module4.md

@@ -10,26 +10,26 @@ To test this module locally:
 * Run command `go test -run Module4` to run all tests for module 4, or
 * Run command `go test -v -run Module4` to run all tests for module 4 with verbose information
 
-## Task 1
+## Task 1: Get help information of `go install`
 To compiles and installs the dependency packages, we use the [`go install` command](https://golang.org/cmd/go/#hdr-Compile_and_install_packages_and_dependencies).
+
 The syntax can be as simple as this:
 ```
 go install <package>
 ```
 
 Same as `go get`, the above `package` can be the git repo of the package if hosted on github (that is, without the `https://` prefix).
 
+To get more information on `go install`, check the output of `go help install`
+
+To get more information about the build flags, check the output of `go help build`
+
+
+## Task 2: Use `go install` to compile and install a package
 Your task is to write a command to import the following package which can be used to provide common case conversion functions. 
 Here is the `go.dev` link: (Note: you need to read and find out the value for `<package>`)
 ```
 https://pkg.go.dev/github.com/codemodus/kace?tab=doc
 ```
 
 In the terminal, type in the command to import the `kace`
-
-## Extra help
-Here is the command to get more information on `go install`: 
-- `go help install`
-
-To get more information about the build flags:
-- `go help build`