Add help for awk

doc/help/README.md

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+index.md

doc/help/awk/README.md

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+index.md

doc/help/awk/index.md

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+# awk
+
+GitAlias has some aliases that use the command `awk` to process data. GitAlias expects to use a current version of GNU `awk` such as version 5.1 or greater. This command is also known as `gawk`.
+
+➤ https://www.gnu.org/software/gawk/
+
+Do you have GNU `awk` installed?
+
+```sh
+awk --version
+```
+
+The output should start with "GNU" then a version number such as:
+
+```sh
+GNU Awk 5.1.1
+```
+
+If the output doesn't start with "GNU", or shows a version number that looks like a long date, such as...
+
+```sh
+awk version 20200816
+```
+
+...then some of the GitAlias data processing commands might not work for you.
+
+
+
+## Install awk
+
+Install `awk` via macOS and `brew` package manager:
+
+```sh
+brew install awk
+```
+
+Install `awk` via Ubuntu and `apt` package manager:
+
+```sh
+apt-get install awk
+```
+
+Install `awk` via Fedora and `yum` package manager:
+
+```sh
+yum install awk
+```
+
+For other ways to install GNU awk, see the GNU awk page.
+
+➤ https://www.gnu.org/software/gawk/
+
+
+## Troubleshooting
+
+
+### Troubleshooting "awk: calling undefined function systime source line number 1"
+
+This error message means that your command `awk` is unable to run the function `systime`. 
+
+This error is likely happening because your system command `awk` is older, or is not fully compatible with GNU `awk`. 
+
+To solve this, install current GNU `awk` as described above.

doc/help/index.md

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+# Help
+
+Help for GitAlias is available via our GitHub link:
+
+➤ https://www.github.com/gitlias/gitlias
+
+We welcome feedback, or issue reports, or pull requests.
+
+Help with specific areas:
+
+* (awk)[awk/]