Move examples to examples dir, now LoadJsonFile() also returns err

* Move examples from cmd to examples dir
* Update Makefile
* LoadJsonFile() dies in-place on read or parse error which is not correct
* LoadJsonFile() wastes Instance map, now it returns its own map and error if any

examples/01-LoadJsonFile/main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"doll/internal/doll"
+	"doll/internal/log"
+	"os"
+
+	"github.com/davecgh/go-spew/spew"
+)
+
+func main() {
+	// Init log subsystem.
+	log.Init("info", os.Stderr)
+
+	file := "example_data/01-config.json"
+
+	// Load the Lua script file.
+	log.Infof("Loading %s", file)
+
+	data, err := doll.LoadJsonFile(file)
+
+	if err != nil {
+		log.Fatalf("Unable to unmarshal %s to map: %s", file, err)
+	}
+
+	log.Infof("Map unmarshalled from %s", file)
+
+	spew.Dump(data)
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */

examples/02-TestLuaScript/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"doll/internal/log"
+	"os"
+
+	lua "github.com/yuin/gopher-lua"
+)
+
+func main() {
+	// Init log subsystem.
+	log.Init("info", os.Stderr)
+
+	file := "example_data/02-test.lua"
+
+	// Load the Lua script file.
+	log.Infof("Loading %s", file)
+
+	// We can execute script directly via L.DoFile("./example_data/02-test.lua") but in practice we'll get scripts as
+	// strings - snippets from templates - so, testing/checking how it works is not use for project.
+	luaCode, err := os.ReadFile(file)
+
+	if err != nil {
+		log.Fatalf("Error reading Lua file %s: %s", file, err)
+	}
+
+	log.Info("Creating new Lua state")
+	L := lua.NewState()
+	defer L.Close()
+
+	log.Info("Evaluating Lua code")
+	if err := L.DoString(string(luaCode)); err != nil {
+		log.Fatalf("Error evaluating Lua code: %s", err)
+	}
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */