Add .vscode files to instruct VSCode how to run ejabberd

.vscode/extensions.json

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+{
+        "recommendations": [
+                "erlang-ls.erlang-ls"
+        ]
+}

.vscode/launch.json

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+{
+        "version": "0.2.0",
+        "configurations": [
+                {
+                        "name": "Relive",
+                        "type": "erlang",
+                        "request": "launch",
+                        "runinterminal": [
+                                ".vscode/relive.sh"
+                        ],
+                        "projectnode": "ejabberd@localhost",
+                        "cookie": "COOKIE",
+                        "timeout": 300,
+                        "cwd": "${workspaceRoot}"
+                },
+                {
+                        "name": "Relive (alternate)",
+                        "type": "erlang",
+                        "request": "launch",
+                        "runinterminal": [
+                                "./rebar3", "shell",
+                                "--apps", "ejabberd",
+                                "--config", "rel/relive.config",
+                                "--script", "rel/relive.escript",
+                                "--name", "ejabberd@localhost",
+                                "--setcookie", "COOKIE"
+                        ],
+                        "projectnode": "ejabberd@localhost",
+                        "cookie": "COOKIE",
+                        "timeout": 300,
+                        "cwd": "${workspaceRoot}"
+                },
+                {
+                        "name": "Attach",
+                        "type": "erlang",
+                        "request": "attach",
+                        "runinterminal": [
+                                "./rebar3", "shell",
+                                "--sname", "clean@localhost",
+                                "--setcookie", "COOKIE",
+                                "--start-clean"
+                        ],
+                        "projectnode": "ejabberd@localhost",
+                        "cookie": "COOKIE",
+                        "timeout": 300,
+                        "cwd": "${workspaceRoot}"
+                }
+        ]
+}

.vscode/relive.sh

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+[ ! -f Makefile ] \
+    && ./autogen.sh \
+    && ./configure --with-rebar=./rebar3 \
+    && make deps
+
+make relive

.vscode/settings.json

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+{
+    "editor.tabSize": 8,
+    "remote.portsAttributes": {
+        "1883": {"label": "MQTT", "onAutoForward": "silent"},
+        "4369": {"label": "EPMD", "onAutoForward": "silent"},
+        "5222": {"label": "XMPP C2S", "onAutoForward": "silent"},
+        "5223": {"label": "XMPP C2S (legacy)", "onAutoForward": "silent"},
+        "5269": {"label": "XMPP S2S", "onAutoForward": "silent"},
+        "5280": {"label": "HTTP", "onAutoForward": "silent"},
+        "5443": {"label": "HTTPS", "onAutoForward": "silent"},
+        "7777": {"label": "XMPP SOCKS5 (proxy65)", "onAutoForward": "silent"}
+    }
+}