Added README

Author: Artur Zakirov

README.md

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+# pg_tsparser - parser for text search
+
+## Introduction
+
+The **pg_tsparser** module is the modified default text search parser from
+PostgreSQL 9.6.
+
+## License
+
+This module available under the same license as
+[PostgreSQL](http://www.postgresql.org/about/licence/).
+
+## Installation
+
+Typical installation procedure may look like this:
+
+    $ cd pg_tsparser
+    $ sudo make USE_PGXS=1 install
+    $ make USE_PGXS=1 installcheck
+    $ psql DB -c "CREATE EXTENSION pg_tsparser;"
+
+After this you can create your own text search configuration:
+
+```sql
+CREATE TEXT SEARCH CONFIGURATION russian_ts (
+    PARSER = tsparser
+);
+
+COMMENT ON TEXT SEARCH CONFIGURATION russian_ts IS 'text search configuration for russian language';
+
+ALTER TEXT SEARCH CONFIGURATION russian_ts
+    ADD MAPPING FOR email, file, float, host, hword_numpart, int,
+    numhword, numword, sfloat, uint, url, url_path, version
+    WITH simple;
+
+ALTER TEXT SEARCH CONFIGURATION russian_ts
+    ADD MAPPING FOR asciiword, asciihword, hword_asciipart
+    WITH russian_stem, english_stem;
+
+ALTER TEXT SEARCH CONFIGURATION russian_ts
+    ADD MAPPING FOR word, hword, hword_part
+    WITH russian_stem, russian_stem;
+```