feat: one text demo

Author: zhaoyang

Example/Podfile

@@ -0,0 +1,13 @@
+use_frameworks!
+
+platform :ios, '9.0'
+
+target 'ZYTextInputAvoidKeyboard_Example' do
+  pod 'ZYTextInputAvoidKeyboard', :path => '../'
+
+  target 'ZYTextInputAvoidKeyboard_Tests' do
+    inherit! :search_paths
+
+    pod 'FBSnapshotTestCase'
+  end
+end

Example/Podfile.lock

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+PODS:
+  - FBSnapshotTestCase (2.1.4):
+    - FBSnapshotTestCase/SwiftSupport (= 2.1.4)
+  - FBSnapshotTestCase/Core (2.1.4)
+  - FBSnapshotTestCase/SwiftSupport (2.1.4):
+    - FBSnapshotTestCase/Core
+  - KVOController (1.2.0)
+  - ZYTextInputAvoidKeyboard (0.1.0):
+    - KVOController (~> 1.2.0)
+
+DEPENDENCIES:
+  - FBSnapshotTestCase
+  - ZYTextInputAvoidKeyboard (from `../`)
+
+SPEC REPOS:
+  trunk:
+    - FBSnapshotTestCase
+    - KVOController
+
+EXTERNAL SOURCES:
+  ZYTextInputAvoidKeyboard:
+    :path: "../"
+
+SPEC CHECKSUMS:
+  FBSnapshotTestCase: 094f9f314decbabe373b87cc339bea235a63e07a
+  KVOController: d72ace34afea42468329623b3379ab3cd1d286b6
+  ZYTextInputAvoidKeyboard: 5690a2ff456e3dfc4e7a9ad9b8b5a90970d28e1c
+
+PODFILE CHECKSUM: 49ea49189da3e85c024544cc628422c43bdde951
+
+COCOAPODS: 1.10.0