add scripts/greetings.md

Signed-off-by: hwipl <33433250+hwipl@users.noreply.github.com>

scripts/greetings.md

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+# greetings.tcl
+
+The script [greetings.tcl](greetings.tcl) greets people who join channels.
+
+## Setup
+
+You can enable the greetings for a specific channel by setting the `greetings`
+flag for the channel in your Eggdrop. For example, enable the script in the
+channel `#test` with the following Eggdrop command:
+
+```
+.chanset #test +greetings
+```
+
+Accordingly, you can disable the greetings for a specific channel by removing
+the `greetings` flag from the channel in your Eggdrop. For example, disable the
+script in the channel `#test` with the following Eggdrop command:
+
+```
+.chanset #test -greetings
+```
+
+## Usage
+
+There are no additional commands required to use this script. After enabling
+the script in channels, the script automatically greets users who join these
+channels.
+
+## Examples
+
+Example of a greeting from the bot after joining a channel:
+
+```
+14:37 -FooBot(lamest@10.0.1.4)- Hi hwipl!
+```