add README.md

Author: LeoGitHuber

README.md

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+# AndroidProjects
+
+##### **My Projects of Learning Android App Development**
+
+There are a few android projects: **DigitalSequence** and **TimeSchoolTable**.
+
+---
+
+### DigitalSequence
+
+This is a project about applying A\* algorithm to finishing Digital Huarong Road automatically.
+
+---
+
+### TimeSchoolTable
+
+This is a project to finish students' time table application. It includes two features:
+
+1. Displaying Time Table by using ViewPager2 as ListView and Gliding pages.
+
+2. Displaying Time Table by using two nested RecyclerView as GridView.