Gitignore & meson build

* Meson build file added
* Gitignore added to ignore in-source build artifacts with make

.gitignore

@@ -0,0 +1,2 @@
+*.so
+*.o

meson.build

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+pg_tde_sources = files(
+        'src/access/pg_tdeam.c',
+        'src/access/pg_tdeam_handler.c',
+        'src/access/pg_tdeam_visibility.c',
+        'src/access/pg_tdetoast.c',
+        'src/access/pg_tde_io.c',
+        'src/access/pg_tde_prune.c',
+        'src/access/pg_tde_rewrite.c',
+        'src/access/pg_tde_vacuumlazy.c',
+        'src/access/pg_tde_visibilitymap.c',
+)
+
+incdir = include_directories('src')
+
+pg_tde = shared_module('pg_tde',
+  pg_tde_sources,
+  c_pch: pch_postgres_h,
+  kwargs: contrib_mod_args,
+  include_directories: incdir,
+)
+contrib_targets += pg_tde
+
+install_data(
+  'pg_tde.control',
+  'pg_tde--1.0.sql',
+  kwargs: contrib_data_args,
+)