add the missing Readme's and DESCRIPTION's for the examples

inst/examples/07_widgets/Readme.md

@@ -1,2 +1 @@
 This example demonstrates some additional widgets included in Shiny, such as `helpText` and `submitButton`. The latter is used to delay rendering output until the user explicitly requests it.
-

inst/examples/08_html/DESCRIPTION

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+Title: Custom HTML UI
+Author: RStudio, Inc.
+AuthorUrl: http://www.rstudio.com/
+License: GPL-3
+DisplayMode: Showcase
+Tags: getting-started
+Type: Shiny

inst/examples/08_html/Readme.md

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+Normally we use the built-in functions, such as `textInput()`, to generate
+the HTML UI in the R script `ui.R`. Actually **shiny** also works with a
+custom HTML page `www/index.html`. See [the
+tutorial](http://rstudio.github.io/shiny/tutorial/#html-ui) for more details.

inst/examples/09_upload/Readme.md

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+We can add a file upload input in the UI using the function `fileInput()`,
+e.g. `fileInput('foo')`. In `server.R`, we can access the uploaded files via
+`input$foo`. See [the
+tutorial](http://rstudio.github.io/shiny/tutorial/#uploads) for more details.

inst/examples/10_download/Readme.md

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+We can add a download button to the UI using `downloadButton()`, and write
+the content of the file in `downloadHandler()` in `server.R`. See [the
+tutorial](http://rstudio.github.io/shiny/tutorial/#downloads) for more
+details.

inst/examples/11_timer/Readme.md

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+The function `invalidateLater()` can be used to invalidate an observer or
+reactive expression in a given number of milliseconds. In this example, the
+output `currentTime` is updated every second, so it shows the current time
+on a second basis.