Add license field to library.json // Resolve #522

HISTORY.rst

@@ -20,6 +20,8 @@ PlatformIO 3.0
 * Handle extra build flags and build script from
   `library.json <http://docs.platformio.org/en/latest/librarymanager/config.html>`__
   (`issue #289 <https://github.com/platformio/platformio/issues/289>`_)
+* Added ``license`` field to `library.json <http://docs.platformio.org/en/latest/librarymanager/config.html>`__
+  (`issue #522 <https://github.com/platformio/platformio/issues/522>`_)
 * Show detailed build information about dependent libraries
   (`issue #617 <https://github.com/platformio/platformio/issues/617>`_)
 * Embedded Board compatibility with more than one development platform

docs/librarymanager/config.rst

@@ -222,6 +222,19 @@ Example:
     },
     "version": "1.0.0"
 
+
+``license``
+-----------
+
+A license of the library. You can check
+`the full list of SPDX license IDs <https://spdx.org/licenses/>`_. Ideally you
+should pick one that is `OSI <https://opensource.org/licenses/alphabetical>`_
+approved.
+
+.. code-block:: javascript
+
+    "license": "Apache-2.0"
+
 .. _libjson_downloadurl:
 
 ``downloadUrl``
@@ -479,7 +492,7 @@ options:
         "flags": "-std=c99"
     }
 
-4. Build source files (``c, cpp, h``) only from the root of the library
+4. Build source files (``c, cpp, h``) at the top level of the library
 
 .. code-block:: javascript