Added search form.

src/snek/form/search_user.py

@@ -0,0 +1,19 @@
+from snek.system.form import Form, FormButtonElement, FormInputElement, HTMLElement
+
+
+class SearchUserForm(Form):
+
+    title = HTMLElement(tag="h1", text="Search user")
+
+    username = FormInputElement(
+        name="username",
+        required=True,
+        min_length=1,
+        max_length=128,
+        place_holder="Username",
+    )
+
+    action = FormButtonElement(
+        name="action", value="submit", text="Search", type="button"
+    )
+