Added PDL project (#8925)

* Added PDL project

Signed-off-by: Mandana Vaziri <mvaziri@us.ibm.com>

* Added PDL to projects sidebar

Signed-off-by: Mandana Vaziri <mvaziri@us.ibm.com>

* change to sidebar

Signed-off-by: Mandana Vaziri <mvaziri@us.ibm.com>

---------

Signed-off-by: Mandana Vaziri <mvaziri@us.ibm.com>

docs/my-website/docs/projects/PDL.md

@@ -0,0 +1,5 @@
+PDL - A YAML-based approach to prompt programming
+
+Github: https://github.com/IBM/prompt-declaration-language
+
+PDL is a declarative approach to prompt programming, helping users to accumulate messages implicitly, with support for model chaining and tool use.

docs/my-website/sidebars.js

@@ -460,6 +460,7 @@ const sidebars = {
           items: [
             "projects/smolagents",
             "projects/Docq.AI",
+            "projects/PDL",
             "projects/OpenInterpreter",
             "projects/Elroy",
             "projects/dbally",