Rename README and DESIGN so their markdown gets picked up my GitHub.

experimental/webtry/DESIGN

Index: experimental/webtry/DESIGN
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-Design
-======
-
-
-Overview
---------
-Allows trying out Skia code in the browser.
-
-
-Security
---------
-We're putting a C++ compiler on the web, and promising to run the results of
-user submitted code, so security is a large concern. Security is handled in a
-layered approach, using a combination of seccomp-bpf, chroot jail and rlimits.
-
-*seccomp-bpf* - Used to limit the types of system calls that the user code can
-make. Any attempts to make a system call that isn't allowed causes the
-application to terminate immediately.
-
-*chroot jail* - The code is run in a chroot jail, making the rest of the
-operating system files unreachable from the running code.
-
-*rlimits* - Used to limit the resources the running code can get access to,
-for example runtime is limited to 5s of CPU.
-
-User submitted code is also restricted in the following ways:
-  * Limited to 10K of code total.
-  * No preprocessor use is allowed (no lines can begin with \s*#).
-
-
-Architecture
-------------
-
-The server runs on GCE, and consists of a Go Web Server that calls out to the
-c++ compiler and executes code in a chroot jail. See the diagram below:
-
-                           
-   +–––––––––––––+         
-   |             |         
-   |  Browser    |         
-   |             |         
-   +––––––+––––––+         
-          |                
-   +––––––+––––––+         
-   |             |         
-   |             |         
-   | Web Server  |         
-   |             |         
-   |   (Go)      |         
-   |             |         
-   |             |         
-   +–––––––+–––––+         
-           |               
-   +–––––––+––––––––––+    
-   | chroot jail      |    
-   |  +––––––––––––––+|    
-   |  | seccomp      ||    
-   |  |  +––––––––––+||    
-   |  |  |User code |||    
-   |  |  |          |||    
-   |  |  +----------+||    
-   |  +––------------+|    
-   |                  |    
-   +––––––––––––––––––+    
-                           
-                           
-The user code is expanded into a simple template and linked against libskia
-and a couple other .o files that contain main() and the code that sets up the
-seccomp and rlimit restrictions. This code also sets up the SkCanvas that is
-handed to the user code. Any code the user submits is restricted to running in
-a single function that looks like this:
-
-
-    void draw(SkCanvas* canvas) {
-      // User code goes here.
-    }
-
-The user code is tracked by taking an MD5 hash of the code The template is
-expanded out into <hash>.cpp, which is compiled into <hash>.o, which is then
-linked together with all the other libs and object files to create an
-executable named <hash>.  That executable is copied into a directory
-/home/webtry/inout, that is accessible to both the web server and the schroot
-jail. The application is then run in the schroot jail, writing its response,
-<hash>.png, out into the same directory, /home/webtry/inout/, where is it read
-by the web server and returned to the user.
-
-Startup and config
-------------------
-The server is started and stopped via:
-
-    sudo /etc/init.d/webtry [start|stop|restart]
-
-By sysv init only handles starting and stopping a program once, so we use
-Monit to monitor the application and restart it if it crashes. The config
-is in:
-
-    /etc/monit/conf.d/webtry
-
-The chroot jail is implemented using schroot, its configuration
-file is found in:
-
-    /etc/schroot/chroot.d/webtry
-
-The seccomp configuration is in main.cpp and only allows the following system
-calls:
-
-    exit_group
-    exit
-    fstat
-    read
-    write
-    close
-    mmap
-    munmap
-    brk
-
-Installation
-------------
-See the README file.
-
-