More 2021 chapters (#2175)

* proposed 2021 chapters

* more chapters

* sql

sql/2021/localization/README.md

@@ -0,0 +1,10 @@
+# 2021 Localization queries
+
+<!--
+  This directory contains all of the 2021 Localization chapter queries.
+
+  Each query should have a corresponding `metric_name.sql` file.
+  Note that readers are linked to this directory, so try to make the SQL file names descriptive for easy browsing.
+
+  Analysts: if helpful, you can use this README to give additional info about the queries.
+-->

sql/2021/structured-data/README.md

@@ -0,0 +1,10 @@
+# 2021 Structured Data queries
+
+<!--
+  This directory contains all of the 2021 Structured Data chapter queries.
+
+  Each query should have a corresponding `metric_name.sql` file.
+  Note that readers are linked to this directory, so try to make the SQL file names descriptive for easy browsing.
+
+  Analysts: if helpful, you can use this README to give additional info about the queries.
+-->

sql/2021/webassembly/README.md

@@ -0,0 +1,10 @@
+# 2021 WebAssembly queries
+
+<!--
+  This directory contains all of the 2021 WebAssembly chapter queries.
+
+  Each query should have a corresponding `metric_name.sql` file.
+  Note that readers are linked to this directory, so try to make the SQL file names descriptive for easy browsing.
+
+  Analysts: if helpful, you can use this README to give additional info about the queries.
+-->

src/content/en/2021/structured-data

@@ -0,0 +1,20 @@
+---
+#See https://github.com/HTTPArchive/almanac.httparchive.org/wiki/Authors'-Guide#metadata-to-add-at-the-top-of-your-chapters
+title: Structured Data
+description: TODO
+authors: []
+reviewers: []
+analysts: []
+editors: []
+translators: []
+results: https://docs.google.com/spreadsheets/d/1uEA217YjpX1xdRVBnIz9ekjpjIrpGIh5GwUxvnzJNig/
+featured_quote: TODO
+featured_stat_1: TODO
+featured_stat_label_1: TODO
+featured_stat_2: TODO
+featured_stat_label_2: TODO
+featured_stat_3: TODO
+featured_stat_label_3: TODO
+---
+
+## TODO