add hivemind placeholder extension.

lnbits/extensions/hivemind/README.md

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+<h1>Hivemind</h1>
+
+Placeholder for a future <a href="https://bitcoinhivemind.com/">Bitcoin Hivemind</a> extension.

lnbits/extensions/hivemind/__init__.py

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+from quart import Blueprint
+from lnbits.db import Database
+
+db = Database("ext_hivemind")
+
+hivemind_ext: Blueprint = Blueprint(
+    "hivemind", __name__, static_folder="static", template_folder="templates"
+)
+
+
+from .views import *  # noqa

lnbits/extensions/hivemind/config.json

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+{
+    "name": "Hivemind",
+    "short_description": "Make cheap talk expensive!",
+    "icon": "batch_prediction",
+    "contributors": ["fiatjaf"]
+}

lnbits/extensions/hivemind/migrations.py

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+# async def m001_initial(db):
+#    await db.execute(
+#        f"""
+#        CREATE TABLE hivemind.hivemind (
+#            id TEXT PRIMARY KEY,
+#            wallet TEXT NOT NULL,
+#            time TIMESTAMP NOT NULL DEFAULT {db.timestamp_now}
+#        );
+#    """
+#    )

lnbits/extensions/hivemind/models.py

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+# from sqlite3 import Row
+# from typing import NamedTuple
+
+
+# class Example(NamedTuple):
+#    id: str
+#    wallet: str
+#
+#    @classmethod
+#    def from_row(cls, row: Row) -> "Example":
+#        return cls(**dict(row))

lnbits/extensions/hivemind/templates/hivemind/index.html

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+{% extends "base.html" %} {% from "macros.jinja" import window_vars with context
+%} {% block page %}
+<q-card>
+  <q-card-section>
+    <h5 class="text-subtitle1 q-mt-none q-mb-md">
+      This extension is just a placeholder for now.
+    </h5>
+    <p>
+      <a href="https://bitcoinhivemind.com/">Hivemind</a> is a Bitcoin sidechain
+      project for a peer-to-peer oracle protocol that absorbs accurate data into
+      a blockchain so that Bitcoin users can speculate in prediction markets.
+    </p>
+    <p>
+      These markets have the potential to revolutionize the emergence of
+      diffusion of knowledge in society and fix all sorts of problems in the
+      world.
+    </p>
+    <p>
+      This extension will become fully operative when the
+      <a href="https://drivechain.xyz/">BIP300</a> soft-fork gets activated and
+      Bitcoin Hivemind is launched.
+    </p>
+  </q-card-section>
+</q-card>
+{% endblock %} {% block scripts %} {{ window_vars(user) }}
+<script>
+  new Vue({
+    el: '#vue',
+    mixins: [windowMixin],
+    data: function () {
+      return {}
+    }
+  })
+</script>
+{% endblock %}

lnbits/extensions/hivemind/views.py

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+from quart import g, render_template
+
+from lnbits.decorators import check_user_exists, validate_uuids
+
+from . import hivemind_ext
+
+
+@hivemind_ext.route("/")
+@validate_uuids(["usr"], required=True)
+@check_user_exists()
+async def index():
+    return await render_template("hivemind/index.html", user=g.user)