add(gitea-api): issues and milestones getters

This implements the api getters for extracting the issues and milestones
for a given gitea repository. WIP for #1.

cmd/gitw/main.go

@@ -1,5 +1,39 @@
 package main
 
-func main() {
+import (
+	"fmt"
+	"os"
 
+	"gitea.yves-biener.de/yves-biener/gitwarrior/internal/gitea"
+)
+
+func main() {
+	repository := gitea.NewRepository("gitwarrior", "yves-biener")
+	server := gitea.NewGitea("https://gitea.yves-biener.de")
+	issues, err := server.GetIssues(repository)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+	}
+	milestones, err := server.GetMilestones(repository)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+	}
+
+	for _, issue := range issues {
+		fmt.Printf("%#v\n", issue)
+	}
+	fmt.Println("---")
+	for _, issue := range milestones {
+		fmt.Printf("%#v\n", issue)
+	}
+
+	// necessary configurations (see config file gitw.json)
+	// - access code for gitea
+	// - configuration for taskwarrior settings?
+
+	// cli actions and parameters
+	// - action: diff (i.e. what has changed between the current state of the taskwarrior tasks and the git issues / milestones)
+	// - action: status (are there changes between the taskwarrior tasks and the gitea issues / milestones, that would require a sync)
+	// - action: sync (synch diffs between taskwarrior tasks and gitea issues / milestones)
+	//   - parameter: --dry-run (do only show changes that would be applied but do not apply them)
 }