core/src/main/java/org/trimou/engine/MustacheEngineBuilder.java
public MustacheEngineBuilder addResolver(Resolver resolver) {
        checkArgumentNotNull(resolver);
        checkNotBuilt();
        this.resolvers.add(resolver);
        return this;
    }
public MustacheEngineBuilder addResolver(Resolver resolver) {
        checkArgumentNotNull(resolver);
        checkNotBuilt();
        this.resolvers.add(resolver);
        return this;
    }
Adds a value resolver.

@param resolver
@return self