Add examples/psutils/mem/exmem

examples/psutil/mem/exmem/.gitignore

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+app

examples/psutil/mem/exmem/README.md

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+# これは何？
+
+[gopsutil](https://github.com/shirou/gopsutil)を用いてメモリ消費量を取得するサンプルです。
+
+v4.24.5から追加された Ex構造体 を利用するサンプルです。
+
+```sh
+$ task
+task: [clean] rm -f ./app
+task: [build] go build -o app .
+task: [run] ./app
+07:40:14 [NORMAL] {"total":67421265920,"available":52788764672,"used":13726756864,"usedPercent":20.359684257913145,"free":31725797376,"active":6271885312,"inactive":21599387648,"wired":0,"laundry":0,"buffers":1032192,"cached":21967679488,"writeBack":0,"dirty":3129344,"writeBackTmp":0,"shared":158375936,"slab":5851881472,"sreclaimable":3740106752,"sunreclaim":2111774720,"pageTables":174186496,"swapCached":22228992,"commitLimit":436363812864,"committedAS":31354429440,"highTotal":0,"highFree":0,"lowTotal":0,"lowFree":0,"swapTotal":402653179904,"swapFree":402577944576,"mapped":1446465536,"vmallocTotal":35184372087808,"vmallocUsed":204656640,"vmallocChunk":0,"hugePagesTotal":0,"hugePagesFree":0,"hugePagesRsvd":0,"hugePagesSurp":0,"hugePageSize":2097152,"anonHugePages":12582912}
+07:40:14 [EX    ] {"activefile":5806538752,"inactivefile":12259991552,"activeanon":465346560,"inactiveanon":9339396096,"unevictable":87674880}
+```

examples/psutil/mem/exmem/Taskfile.yml

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+# https://taskfile.dev
+
+version: '3'
+
+tasks:
+  default:
+    cmds:
+      - task: clean
+      - task: build
+      - task: run
+  build:
+    cmds:
+      - go build -o app .
+  run:
+    cmds:
+      - ./app
+  clean:
+    cmds:
+      - rm -f ./app

examples/psutil/mem/exmem/main.go

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+//go:build linux
+
+package main
+
+import (
+	"log"
+
+	"github.com/shirou/gopsutil/v4/mem"
+)
+
+func main() {
+	log.SetFlags(log.Ltime)
+
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() error {
+	var (
+		vmem   *mem.VirtualMemoryStat
+		exVmem *mem.ExVirtualMemory
+		err    error
+	)
+	// マルチプラットフォームで利用出来る方法
+	vmem, err = mem.VirtualMemory()
+	if err != nil {
+		return err
+	}
+
+	// 各OSごとに特化している情報を取得する方法
+	exVmem, err = mem.NewExLinux().VirtualMemory()
+	if err != nil {
+		return err
+	}
+
+	log.Printf("[NORMAL] %s", vmem)
+	log.Printf("[EX    ] %s", exVmem)
+
+	return nil
+}