[feat] add demo readme for command line compile

examples/adc/adc_continuous_differential/readme.md

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+```bash
+
+$ make APP=adc_continuous_differential BOARD=bl706_iot
+
+```

examples/adc/adc_continuous_single_ended/readme.md

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+```bash
+
+$ make APP=adc_continuous_single_ended BOARD=bl706_iot
+
+```

examples/adc/adc_key/readme.md

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+```bash
+
+$ make APP=adc_key BOARD=bl706_iot
+
+```

examples/adc/adc_one_shot_differential/readme.md

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+```bash
+
+$ make APP=adc_one_shot_differential BOARD=bl706_iot
+
+```

examples/adc/adc_one_shot_single_ended/readme.md

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+```bash
+
+$ make APP=adc_continuous_differential BOARD=bl706_iot
+
+```

examples/adc/adc_scan_single_ended/readme.md

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+```bash
+
+$ make APP=adc_one_shot_single_ended BOARD=bl706_iot
+
+```

examples/adc/adc_tsen/readme.md

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+```bash
+
+$ make APP=adc_tsen BOARD=bl706_iot
+
+```

examples/adc/adc_vbat_poll/readme.md

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+```bash
+
+$ make APP=adc_vbat_poll BOARD=bl706_iot
+
+```