turn into md, update to meson build

README.md

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+# README for dbtool 1.9.1 (21/11/2025)
+
+dbtool can be used to store and retrieve data in a key/value
+format in a hash database. Perl compatible regular expressions
+are supported both for storing and retrieving of data. It's
+main advantages are the ability to maintain huge amounts of
+data and speed.
+
+ 
+
+
+# Requirements
+
+You need either the GNU gdbm library or the Berkeley database
+system. You can find gdbm at:
+  http://www.gnu.org/software/gdbm/gdbm.html
+And the berkeley library at: http://www.sleepycat.com.
+
+You will also need `meson` and `ninja`: https://mesonbuild.com/.
+
+If you want to build the manual page, you'll need perl as well.
+
+
+
+# Installation from source
+
+Check out the source and execute:
+
+```default
+meson setup build
+ninja -C build
+```
+
+You can supply some additional parameters to meson,
+type `meson configuration` for details.
+
+To install, execute:
+
+```default
+sudo ninja -C install
+```
+
+
+# Documentation
+
+After successfully installation read the installed man-
+page:
+
+```default
+man dbtool
+```
+
+You can also read the manual page [online](dbtool.pod).
+
+# Report bugs
+
+[Please open an issue](https://codeberg.org/scip/dbtool/issues). Thanks!
+
+
+# License and Disclaimer
+
+dbtool is Copyright (c) 2001-2025 by T.v. Dein. dbtool may be
+used and distributed under the terms of the GNU General Public
+License. All other brand and product names are trademarks,
+registered trademarks or service marks of their respective
+holders.
+
+These programs are distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied
+warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this distribution; if not, write to the
+
+
+    Free Software Foundation, Inc.
+    59 Temple Place
+    Suite 330
+    Boston, MA 02111
+    USA
+
+
+
+
+