feat: fixed at_talk (#248)

* feat: atclient_notify_params_create has const params now

* fix: atclietn_notify bug where ciphertext buffer wasn't large enough

* feat: at_talk working sending messages

* feat: colour code constants

* feat: working at_talk

* docs: at_talk description

* ci: add at_talk back to our CI

.github/workflows/tests.yaml

@@ -45,11 +45,11 @@ jobs:
         run: |
           tools/install.sh
 
-      # - name: Build at_talk
-      #   working-directory: examples/desktop/at_talk
-      #   run: |
-      #     cmake -S . -B build
-      #     cmake --build build
+      - name: Build at_talk
+        working-directory: examples/desktop/at_talk
+        run: |
+          cmake -S . -B build
+          cmake --build build
 
       - name: Build all CRUD examples
         working-directory: examples/desktop/crud

examples/desktop/at_talk/README.md

@@ -0,0 +1,46 @@
+# at_talk
+
+## Description
+
+at_talk is a simple demo of using notify/monitor for two atSigns to talk to each other end-to-end encrypted.
+
+## Quick Start
+
+Open two terminals. Replace `@bob` and `@alice` with your atSigns. It is assumed that each of the terminals has read access to the existing .atKeys files that are found in `~/.atsign/keys/`.
+
+On terminal 1:
+
+```sh
+./run.sh -f @bob -t @alice
+```
+
+On terminal 2;
+
+```sh
+./run.sh -f @alice -t @bob
+```
+
+## Demo
+
+Here's an example of two atSigns talking to each other. In this case, I have keys to `@soccer0` and `@soccer99`. My atKeys were placed in `~/.atsign/keys/` (so my key files were ~/.atsign/keys/@soccer_0_key.atKeys and ~/.atsign/keys/@soccer_99_key.atKeys).
+
+Terminal 1:
+
+```
+$ ./run.sh -f @soccer0 -t @soccer99
+Setup (1/3) .. (2/3) .. (3/3).
+@soccer0 -> Here's an example of at_talk in action.
+@soccer0 -> 
+@soccer99: Cool isn't it?
+```
+
+Terminal 2:
+
+```
+$ ./run.sh -f @soccer99 -t @soccer0
+Setup (1/3) .. (2/3) .. (3/3).
+@soccer99 -> 
+@soccer0: Here's an example of at_talk in action.
+Cool isn't it?
+@soccer99 -> 
+```