README for 2.0.

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-This is a placeholder for TinyOS 2.0.  When it is released you will find the source for 
-it here.
+This contains the TinyOS 2.0 source code as of\r
+\r
+$Date$\r
+\r
+This tree includes the TinyOS 2.0 documentation in tinyos-2.x/doc; \r
+you can also find the documentation online at:\r
+http://www.tinyos.net/tinyos-2.x/doc/\r
+\r
+The basic directory structure is as follows:\r
+\r
+apps: Sample TinyOS applications.\r
+  tests: Sample TinyOS applications which test a part of the system.\r
+\r
+doc: Documentation\r
+  index.html: Index file to all documentation\r
+  txt: Text files (TEPs)\r
+  html: HTML files (TEPs, installation)\r
+  html/tutorial: Tutorials\r
+\r
+support: Non-nesC code for using TinyOS nodes\r
+  make: TinyOS make system\r
+  sdk: Standard developers kit: serial communication, etc.\r
+    c: C SDK (fully supported, but not exhaustively tested yet)\r
+    java: Java SDK (fully supported, heavily tested and used)\r
+    python: Python SDK (limited, not fully supported)\r
+\r
+tools: TinyOS-specific tools and scripts\r
+  platforms: Platform-specific tools\r
+  release: Scripts and configurations for packaging release RPMs\r
+  tinyos: TinyOS scripts\r
+    java: Native support for TinyOS JNI libraries (serial and env)\r
+    misc: Assorted utility scripts, begininning with tos-\r
+    ncc: The scripts that invoke the nesC compiler: ncc, mig, ncg\r
+    \r
+tos: TinyOS source code (nesC, C)\r
+  chips: Chip-specific code\r
+  interfaces: Core system interfaces\r
+  lib: Extensions and larger common subsystems\r
+  platforms: Platform-specific code\r
+  sensorboards: Sensorboard drivers\r
+  system: Core system components\r
+  types: Core system data types (header files)\r
+\r
+\r