Add a README for CCS projects

PUBLISHED_FROM=3ccf4c043056677cd9c8fbd19e5e36961281af8c

examples/CC3200/ccs/README.md

+This directory contains Code Composer Studio projects for Mongoose.
+
+ - Mongoose: the library project, produces a static library (`Mongoose.a`).
+
+ - MG_sensor_demo: a demo application that serves files from SLFS and outputs
+   sensor data to the WebSocket connection. It uses the Mongoose library project,
+   so you'll need to import both.
+
+CC3200SDK_1.2.0 needs to be installed in ${TI_PRODUCTS_DIR} (`C:\TI` on Windows, `~/ti` on Linux).
+
+*Note:* When importing projects, make sure the `Copy projects into workspace` checkbox is *not* checked.