faker: add page (#16100)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/faker.md

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+# faker
+
+> A Python library and a tool to generate fake data.
+> More information: <https://faker.readthedocs.io/en/master/>.
+
+- Show all fake data providers along with examples:
+
+`faker`
+
+- Generate fake data of a specific type:
+
+`faker {{name|address|passport_full|credit_card_full|phone_number|email|company|date_time|user_name|password|job|...}}`
+
+- Generate a number of fake addresses from a specific country (use `localectl list-locales | cut -d. -f1` to get list of locales):
+
+`faker --repeat {{number}} --lang {{de_DE|de_CH|...}} address`
+
+- Generate a number of cities in a specific country and output them to a file (use `localectl list-locales | cut -d. -f1` to get list of locales):
+
+`faker --repeat {{number}} --lang {{en_AU|en_US|...}} city -o {{path/to/file.txt}}`
+
+- Generate a number of random HTTP user-agents showing verbose output:
+
+`faker --repeat {{number}} --verbose user_agent`
+
+- Generate a number of domain names and separate each using a specific separator:
+
+`faker --repeat {{number}} --sep '{{,}}' domain_name`