Restore removed driver, add header discussing drivers

Author: jamesmunns

newsletters/2018-03-15.md

@@ -20,6 +20,9 @@ If you have an embedded project or blog post you would like to have featured in
 
 ### `embedded-hal` drivers
 
+This is a list of recently released drivers that are part of the [Weekly Driver Initiative]. There are currently 5 Released Drivers, 14 WIP Drivers, and lots of TODOs!
+
+* [pcein] has released the third weekly driver for the [`adc-mcp3008`], an 8-channel 10-bit ADC.
 * [japaric] has [released][enc-blog] the fourth weekly driver for the [`enc28j60`], an Ethernet controller with SPI interface.
 * [dbrgn] has [released][mcp-blog] the fifth weekly driver for the [`mcp3425`], a 16-bit ADC with I2C interface.
 
@@ -75,4 +78,5 @@ semantics. Details in issue [#63].
 [therealprof]: https://github.com/therealprof
 [Tock-OS]: https://github.com/helena-project/tock
 [varkor]: https://github.com/varkor
+[Weekly Driver Initiative]: https://github.com/rust-lang-nursery/embedded-wg/issues/39
 [xargo-lld]: https://github.com/japaric/xargo/pull/200