Add simple cache

cache/simple_cache/cache.go

@@ -0,0 +1,41 @@
+package simple_cache
+
+import (
+	"sync"
+)
+
+type Cache struct {
+	sync.RWMutex
+	items map[string]interface{}
+}
+
+func NewCache() *Cache {
+	return &Cache{
+		items: make(map[string]interface{}),
+	}
+}
+
+func (c *Cache) Set(key string, value interface{}) {
+	c.Lock()
+	defer c.Unlock()
+
+	c.items[key] = value
+}
+
+func (c *Cache) Get(key string) (interface{}, bool) {
+	c.RLock()
+	defer c.RUnlock()
+
+	item, found := c.items[key]
+
+	return item, found
+}
+
+func (c *Cache) Delete(key string) {
+	c.Lock()
+	defer c.Unlock()
+
+	if _, found := c.items[key]; found {
+		delete(c.items, key)
+	}
+}