simpleperf: Update doc for Android O.

1. Refactor README.md:
   a. Add menu.
   b. Add `Tools in simpleperf` section.
   c. Use real examples in `Android application profiling`,
      add checks for how to prepare the application.
   d. Link to examples workable on Android O.
2. Use `ps -e` instead of `ps` for Android O in app_profiler.py.
3. Remove a failed assert in annotate.py.
4. Upload demo projects.

Bug: http://b/35157971
Test: follow examples on linux and mac.
Change-Id: Iab115bdca3d5abad56fcdc048ccc75f867f5bd6b
92 files changed