installer: clean up codebase

* introduce helper soft package to work with SoftServe
* move commands to cmd/
diff --git a/core/installer/soft/config.go b/core/installer/soft/config.go
new file mode 100644
index 0000000..b674377
--- /dev/null
+++ b/core/installer/soft/config.go
@@ -0,0 +1,49 @@
+package soft
+
+type Repository struct {
+	Name       string `json:"name"`
+	Repository string `json:"repo"`
+	Private    bool   `json:"private"`
+	Note       string `json:"note"`
+}
+
+type User struct {
+	Name       string   `json:"name"`
+	Admin      bool     `json:"admin"`
+	PublicKeys []string `json:"public-keys"`
+}
+
+type Config struct {
+	Name         string       `json:"name"`
+	Host         string       `json:"host"`
+	Port         int          `json:"port"`
+	AnonAccess   string       `json:"anon-access"`
+	AllowKeyless bool         `json:"allow-keyless"`
+	Repositories []Repository `json:"repos"`
+	Users        []User       `json:"users"`
+}
+
+func DefaultConfig(adminKeys []string) Config {
+	return Config{
+		Name:         "PCloud",
+		Host:         "localhost",
+		Port:         22,
+		AnonAccess:   "no-access",
+		AllowKeyless: false,
+		Repositories: []Repository{
+			{
+				Name:       "Home",
+				Repository: "config",
+				Private:    true,
+				Note:       "Configuration for PCloud SoftServe deployment",
+			},
+		},
+		Users: []User{
+			{
+				Name:       "Admin",
+				Admin:      true,
+				PublicKeys: adminKeys,
+			},
+		},
+	}
+}