feat: add icp-js-signer to projects (#201)

Add https://github.com/dfinity/icp-js-signer to projects.

Author: sea-snake

projects.json

@@ -25,6 +25,14 @@
       "branch": "icp-pages",
       "subdirectory": "canisters"
     },
+    {
+      "title": "Signer",
+      "description": "Library to interact with ICP signers",
+      "category": "library",
+      "repository": "dfinity/icp-js-signer",
+      "branch": "icp-pages",
+      "subdirectory": "signer"
+    },
     {
       "title": "Pic JS",
       "description": "A canister testing framework",