Unify example apps across all example platforms. (#215)

examples/apps/cli/README.md

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+# OpenThread CLI Example
+
+This example application demonstrates a minimal OpenThread application
+that exposes the OpenThread configuration and management interfaces
+via a basic command-line interface. The steps below take you through
+the minimal steps required to ping one emulated Thread device from
+another emulated Thread device.
+
+## 1. Build
+
+```bash
+$ cd <path-to-openthread>
+$ ./bootstrap
+$ make -f examples/Makefile-posix
+```
+
+## 2. Start node 1
+
+Spawn the process:
+
+```bash
+$ cd openthread/examples/posix/app/cli
+$ ./ot-cli 1
+```
+
+Start OpenThread:
+
+```bash
+> start
+Done
+```
+
+Wait a few seconds and verify that the device has become a Thread Leader:
+
+```bash
+> state
+leader
+Done
+```
+
+View IPv6 addresses assigned to Node 1's Thread interface:
+
+```bash
+> ipaddr
+fdde:ad00:beef:0:0:ff:fe00:0
+fe80:0:0:0:0:ff:fe00:0
+fdde:ad00:beef:0:558:f56b:d688:799
+fe80:0:0:0:f3d9:2a82:c8d8:fe43
+Done
+```
+
+## 2. Start node 2
+
+Spawn the process:
+
+```bash
+$ cd openthread/examples/posix/app/cli
+$ ./ot-cli 2
+```
+
+Start OpenThread:
+
+```bash
+> start
+Done
+```
+
+Wait a few seconds and verify that the device has become a Thread Router:
+
+```bash
+> state
+router
+Done
+```
+
+## 3. Ping Node 1 from Node 2
+
+```bash
+> ping fdde:ad00:beef:0:558:f56b:d688:799
+16 bytes from fdde:ad00:beef:0:558:f56b:d688:799: icmp_seq=1 hlim=64
+```
+
+## 4. Want more?
+
+You may note that the example above did not include any network parameter configuration, such as the IEEE 802.15.4 PAN ID or the Thread Master Key. OpenThread currently implements default values for network parameters, however, you may use the CLI to change network parameters, other configurations, and perform other operations.
+
+See the [OpenThread CLI Reference README.md](../../../../src/cli/README.md) to explore more.