add boot delay component

components/boot_delay/README.md

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+# delay boot for a period of time
+
+A component to make the boot wait at a certain priority.
+Can be used multiple times.
+
+Example:
+```yaml
+boot_delay:
+  delay: 5s   # the amount of time since the boot started
+  setup_priority: 600
+```
+

components/boot_delay/__init__.py

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+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.const import CONF_ID, CONF_DELAY
+
+MULTI_CONF = True
+
+set_ns = cg.esphome_ns.namespace('boot_delay')
+BootDelay = set_ns.class_('BootDelay', cg.Component)
+
+CONFIG_SCHEMA = cv.COMPONENT_SCHEMA.extend({
+    cv.GenerateID(): cv.declare_id(BootDelay),
+    cv.Required(CONF_DELAY): cv.positive_time_period_milliseconds,
+})
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    cg.add(var.set_delay(config[CONF_DELAY]))

components/boot_delay/boot_delay.cpp

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+#include "boot_delay.h"
+#include "esphome/core/hal.h"
+
+namespace esphome {
+namespace boot_delay {
+
+bool BootDelay::can_proceed() {
+  return millis() >= this->delay_;
+}
+
+}  // namespace boot_delay
+}  // namespace esphome
+

components/boot_delay/boot_delay.h

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+#pragma once
+
+#include "esphome/core/component.h"
+
+namespace esphome {
+namespace boot_delay {
+
+class BootDelay : public Component {
+ public:
+  bool can_proceed() override;
+  void set_delay(uint32_t delay) { this->delay_ = delay; }
+
+ protected:
+  uint32_t delay_;
+};
+
+}  // namespace boot_delay
+}  // namespace esphome
+