📝 Add README

README.md

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+# ezcache
+
+ezcache is a simple in-memory cache for golang that has data expiry.
+
+## Usage
+
+```go
+import "codeberg.org/danjones000/ezcache"
+
+// ...
+
+// Create a user cache which will cache users for five minutes
+userCache := ezcache.New(func(id uint64) (User, error) {
+    // logic to fetch user from database
+    return User{}, nil
+}, 5 * time.Minute)
+
+user, err := user.Get(userID)
+// Next time you do user.Get with the same userID within five minutes, it will be fetched from cache.
+// After five minutes, it will fetch from the database again.
+```