examples: Extend example with basic trust schema (validator-config)

Change-Id: Iaf9f4abd57563e52cb167b55ba3b27d8ecc1ecd7
diff --git a/examples/README.md b/examples/README.md
index 22b71ac..f1f829c 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -1,22 +1,22 @@
-ndn-cxx examples
-================
+# ndn-cxx examples
 
-By default, examples in `examples/` folder are not built.  To enable them, use
+By default, the examples in `examples/` folder are not built. To enable them, use
 `--with-examples` configure option. For example:
 
     ./waf configure --with-examples
     ./waf
 
-There are two ways to add new examples, depending on their complexity:
+There are two ways to add new examples, depending on their complexity.
 
-1. Examples with a single translation unit
+1. **Examples with a single translation unit**
 
-  For simple examples that have a single translation unit, the `.cpp` file can be directly put
-  in `examples/` folder and it will be automatically compiled on the next run of `./waf`. Name
-  of the compiled binary will be determined by the base name of the `.cpp` file.  For example,
-  `examples/foo.cpp` will be compiled into binary `foo` in `<build>/examples` folder:
+    For simple examples that have a single translation unit, the `.cpp` file can be directly put
+    in the `examples/` folder and it will be automatically compiled on the next run of `./waf`.
+    The name of the compiled executable will be determined by the base name of the `.cpp` file.
+    For instance, `examples/foo.cpp` will be compiled into an executable named `foo` inside the
+    `build/examples` folder:
 
-        echo "int main() { return 0; }" > examples/foo.cpp
+        echo 'int main() { return 0; }' > examples/foo.cpp
         ./waf
         # ... Compiling examples/foo.cpp
         # ... Linking build/examples/foo
@@ -24,25 +24,23 @@
         # To run the example
         ./build/examples/foo
 
-2. Examples with multiple translation units
+2. **Examples with multiple translation units**
 
-  For more complex examples that contain multiple translation units, one can use
-  the following directory structure:
+    For more complex examples that contain multiple translation units, one can use
+    the following directory structure:
 
-  - Create a directory under `examples/` folder (e.g., `examples/bar`).
-    The name of this directory will determine the name of the compiled binary
-   (`<build>/examples/bar/bar`)
+    - Create a directory under the `examples/` folder (e.g., `examples/bar`). The name of this
+      directory will determine the name of the compiled executable (`build/examples/bar/bar`).
+    - Place any number of translation units (e.g., `examples/bar/a.cpp`, `examples/bar/b.cpp`,
+      ...) in this directory. All `.cpp` files in this directory will be compiled and linked
+      together to produce the binary executable of the example. One of the .cpp files must
+      contain the `main()` function.
 
-  - Place any number of translation units (e.g., `examples/bar/a.cpp`, `examples/bar/b.cpp`,
-    ...) in this directory.  All `.cpp` files in this directory will be compiled and linked
-    together to produce the binary of the example.  One of the .cpp files should contain
-    the `main()` function.
-
-  For example:
+    For example:
 
         mkdir examples/bar
-        echo "int bar(); int main() { return bar(); }" > examples/bar/a.cpp
-        echo "int bar() { return 10; } " > examples/bar/b.cpp
+        echo 'int bar(); int main() { return bar(); }' > examples/bar/a.cpp
+        echo 'int bar() { return 10; }' > examples/bar/b.cpp
         ./waf
         # ... Compiling examples/bar/a.cpp
         # ... Compiling examples/bar/b.cpp
@@ -50,3 +48,18 @@
 
         # To run the example
         ./build/examples/bar/bar
+
+## Security configuration for example apps
+
+In order for the ``consumer`` example app to be able to properly authenticate data packets
+created by the ``producer`` app, you must configure the following parameters.
+
+1. Generate example trust anchor:
+
+        ndnsec key-gen /example
+        ndnsec cert-dump -i /example > example-trust-anchor.cert
+
+2. Create a key for the producer and sign it with the example trust anchor:
+
+        ndnsec key-gen /example/testApp
+        ndnsec sign-req /example/testApp | ndnsec cert-gen -s /example -i example | ndnsec cert-install -