Added more stuff in README.md

README.md

@@ -43,7 +43,27 @@ TODO webdav apis with an htpasswd file through nginx basic authentication
 TODO webdav apis with database managed through django
 
 # Building
-TODO
+After cloning this repository in $gitdir clone the nginx source code in $gitdir/nginx
+cd $gitdir/nginx
+./configure  --add-dynamic-module=../../nginx-sf-webdav-module/' --with-compat
+make
+then the module is in $gitdir/nginx/objs/ngx_http_webdav_module.so
+to compile the module statically just replace --add-dynamic-module with --add-module
+
+# Requirements
+
+- nginx version >= 1.13.4
+
+- libxml2 + libxslt
+
+The libxslt library is technically redundant and is only required since this combination is supported by nginx for the xslt module. Using builtin nginx mechanisms for linking against third-party libraries brings certain compatibility benefits. However this redundancy can be easily eliminated in the config file.
+
+# Locking
+
+- Only the exclusive write locks are supported, which is the only type of locks described in the WebDAV specification.
+
+- All currently held locks are kept in a list. Checking if an object is constrained by a lock requires O(n) operations. A huge number of simultaneously held locks may degrade performance. Thus it is not recommended to have a large lock timeout which would increase the number of locks.
+
 
 # Testing
 TODO