Add placeholder libraries for things we probably refer to as libraries

Author: Jimmy Brisson

features/frameworks/greentea-client/mbed_lib.json

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+{
+    "name": "greentea-client"
+}

features/frameworks/mbed-client-cli/mbed_lib.json

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+{
+    "name": "mbed-client-cli"
+}

features/frameworks/mbed-coap/mbed_lib.json

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+{
+    "name": "mbed-coap"
+}

features/frameworks/unity/mbed_lib.json

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+{
+    "name": "unity"
+}

features/mbedtls/mbed_lib.json

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+{
+    "name": "mbedtls"
+}

features/nanostack/mbed_lib.json

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+{
+    "name": "nanostack"
+}

features/nfc/mbed_lib.json

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+{
+    "name": "nfc"
+}

features/storage/system_storage/mbed_lib.json

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+{
+    "name": "system-storage"
+}